Probably a bug with the resolution again.
The issue I brough up has nothing to do with resolution or picture sizes.
I never see that message, my screenshots and animations are always within limits. I think we talked about this before and agreed that your 4K display at high resolutions is causing the captures to be too big. The forum limit is reasonable IMO.
Anyway, back to what I was talking about. This is how ST window supposed to behave. After taking the shot, the window resizes to acomodate the size of the pic, not randomly going off screen with random sizes.
That is the way it behaves on my machines public build.
But on dev the behavior is slightly different, it does not reopen automatically, I have to click on the taskbar icon again and then it reopens the same way, it is not repositioning randomly as in your case. It always opens in the same spot and with the same size. 🤷♂️
Again, your screen is not a standard size, and they have plenty of bugs for different resolutions.
Also, with your resolution I can paste without issues, because the size of the file is much smaller.