Based on the dates you provided, most likely the reduction in the refund has nothing to do with unemployment. The IRS may adjust the refund for several reasons. For example, they received a W2 or a 1099 that was not reported on the return.
Usually they send a notice explaining the adjustments. You can also get an IRS transcript of the 2020 return which will have the adjustments they made. You can compare the transcript to the tax return in TurboTax to figure out what changes the IRS made to the tax return.
You can use the IRS link below to request a transcript.
https://www.irs.gov/individuals/get-transcript
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