this is a fairly common problem i dont see people acknowledge. When you begin a heavy tactical puzzle regimen, you begin over-compensating in your games, because you are trying to see the fruits of your labor, but this usually takes weeks or even months to fully manifest. Instead you begin focusing in moments where there is nothing to focus, or you get a false confidence in certain positions
it happens to me even at my level. You have to learn to power through and make it an exercise in not trying too hard to force results before they are due. The mind takes time to organically acclimate to a careful rigorous regimen.
I wrote about this since i had the same problem as the OP.
https://www.chess.com/blog/foobarred1/part-iv-hitting-the-chess-gym-with-tactical-training