Filed Ammended Return, then recieved CP21B

On 4/8/21, I filed an amended return due to my employer missing a weeks payroll.(w2c).

I have not received the small refund that Turbotax came up with.

However, I received a refund last week, which is more than that and now a letter, a CP21B, stating a refund due to tax law changes to correct unemployment compensation..

Note , I was unemployed for two weeks early in 2020 due to covid.

What changes could have given me this refund and should i be bothered about not having received the amended refund yet.