Help me figure out why

The IRS is seriously behind in processing 2020 tax returns.  This is due to many factors, such as the pandemic, completing processing of millions of 2019 tax returns, stimulus payments, unemployment compensation exclusion tax refunds., changes in the tax code by Congress in the middle of the 2020 tax season and the like.

Millions of taxpayers have not yet received there federal tax refunds.

Go to this IRS website for operational status - https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue

As of June 5, 2021, we had 18.2 million unprocessed individual returns in the pipeline. Unprocessed returns include tax year 2020 returns such as those requiring correction to the Recovery Rebate Credit amount or validation of 2019 income used to figure the Earned Income Tax Credit (EITC) and Additional Child Tax Credit (ACTC). This work does not require us to correspond with taxpayers but does require special handling by an IRS employee so, in these instances, it is taking the IRS more than 21 days to issue any related refund. If, as a result, a correction is made to any RRC, EITC or ACTC claimed on the return, the IRS will send taxpayers an explanation. Taxpayers are encouraged to continue to check Where’s My Refund? for their personalized refund status and can review Tax Season Refund Frequently Asked Questions.

Once a tax return has been Accepted by the IRS or a State, TurboTax receives no further information concerning the tax return or the status of any tax refund.

If accepted by the IRS use the federal tax refund website to check the refund status - https://www.irs.gov/refunds

After the tax return has been Accepted by the IRS (meaning only that they received the return) it will be in the Processing mode until the tax refund has been Approved and then an Issue Date will be available on the IRS website.
See this IRS website for federal tax refund FAQ's - https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions
If over 21 days since being Accepted by the IRS and the tax refund is still Processing you can call the IRS and speak with an IRS agent concerning your tax refund.
Call the IRS: 1-800-829-1040 hours 7 AM - 7 PM local time Monday-Friday
When calling the IRS do NOT choose the first option re: "Refund", or it will send you to an automated phone line.
So after first choosing your language, then do NOT choose Option 1 (refund info). Choose option 2 for "personal income tax" instead.
Then press 1 for "form, tax history, or payment".
Then press 3 "for all other questions."
Then press 2 "for all other questions."
- When it asks you to enter your SSN or EIN to access your account information, don't enter anything.
- After it asks twice, you will get another menu.

Press 2 for personal or individual tax questions.
Then press 4 for all other inquiries
It should then transfer you to an agent.

The IRS is seriously backlogged due to all the new tax laws and extra stimulus filings, as well as unprocessed 2019 returns left over from the COVID shutdown.  Lots of other folks are still waiting (some since mid-February), so please continue to be patient.  Also see:

At least 8 million tax returns are in limbo at the IRS because of the pandemic, delaying refunds (ms...

Have you checked your status here: TurboTax and IRS ?

Although the IRS has processed and issued most refunds from e-filed returns around 21 days, because of the pileup caused by Covid, CARES Act, stimulus and the American Rescue Plan Act, some of the returns will require more time to review. 

Several items can  delay the processing of the 2020 return ... some of which are :   

> unemployment

> repayment of the PTC

> stimulus credit  on line 30 of the 2020 form 1040

> if you used the 2019 earned income for the 2020 EIC &/or  CTC/ACTC

> if you have prior year balance dues or unfiled returns

> the info on the W-2 doesn't match what the employer sent in and/or the employer's W-2 is not yet on file

> a variety of other items that require humans to look at

Due to understaffing and over tasking at the IRS again this year many returns will be delayed for as much as months.  The aging computer system is being over taxed trying to process millions of  2019 returns and 2020 returns (some of which will need extra processing this year due to the late tax law changes)  AND putting out the third stimulus payments.  If you want to vent to someone then contact your  local congress person and demand they fund the IRS sufficiently so that they can hire enough people and update their computer systems to handle all of the demands made upon this agency.  The IRS  can only do so much with the continued reductions to their budget. 

See these  recent news articles for a good laugh:

Where is my damn IRS tax refund? New answers emerge as delays frustrate millions (msn.com)

https://money.yahoo.com/taxpayers-waiting-to-get-last-years-tax-refund-190333088.html

https://money.yahoo.com/irs-employees-say-out-of-ink-printers-are-delaying-tax-returns-171522801.html