Yep, I think you might have highlighted a bug, Certain it is happening in firefox , and is not present on the android app.Have learnt to ignore it , almost always my comment has been added.
Edit yep immediately clicked on comments open new tab and my comment is here where as it is still spinning in the other tab. So probably a bug rather than overload.
I am just never going back, lemmy has less content of course but the comments on what is here is just a totally different level, reddit just feels dirty and corrupt in comparison,