I also switched from vterm and ghostel is much more responsive for me. Thanks for maintaining it! I use it everyday.
I do see a similar issue, where when I switch to the ghostel buffer and it wasn’t visible before, the text is scrambled. I’ll check if I can find a way to reliably reproduce it.
This is a known issue that I've been chasing myself. It most likely has to do with the fact that we cannot render hidden buffers (for reasons) so when the buffer reappears again, we have hooks to refresh it. But sometimes it fails to refresh fully.
When are you mostly seeing this? With agent TUIs?