Weird, buggy rendered messages

[x] I have searched open and closed issues for duplicates
[x] I am submitting a bug report for existing functionality that does not work as intended
[x] This isn't a feature request or a discussion topic

Some of my messages are flying above the other messages and are rendered weirdly. Those messages don't move, when I scroll and are pinned on top of the screen. If I scroll more, the messages stop moving and seem to belong to this place of the chat, although they were sent at a much later time.
Other messages are scaled weird and obscure parts of their text.
Messages can obscure other messages.