Are you using the wrong refund amount when you track it on the IRS site?
https://turbotax.intuit.com/tax-tools/efile-status-lookup/
Sometimes people get confused by the “summary” given by TurboTax and use the wrong amount for the federal refund. Make sure you are only using the federal refund amount, and not an amount that combined your federal and state refunds.
Your federal refund amount is on line 35a of your Form 1040
https://www.irs.gov/refunds