Odd behavior across multiple PCs

PC1 = desktop 9900k/2060 Win 11 Pro
PC2 = multimedia 4790K/1030 Win 10 Home
PC3 = laptop i3/HD5500 Win 10 Home
PC4 = desktop 7800X3D/4070 Win 11 Pro

The only common thing between them is my Microsoft account. This happens on all 4 PCs:

First problem is that when logging in, the language selector shows on taskbar, despite being hidden. I use US language for OS with another one for my keyboard. If I sign out and back in, the circle loading icon and cursor will stutter, I get to desktop and language selector is gone.

The second problem that I think is related to the first one is random stutters. Again this happens now and then on all 4 PCs. My sign in background is also black, even on the new PC.

I don't have account sync on and this started happening about 2 years ago on PC1, before I got the other PCs. I pretty much have up and accepted it, but when I recently got PC4 that have the same problem, it was just too much for me.

I hope someone got a solution.