I tried Instagram stories on my Edge Version 89.0.774.76 (Official build) (64-bit) and also Version 91.0.845.2 (Official build) dev (64-bit) I have a bunch of extensions too. everything loaded correctly (I'm on Windows) I don't know exactly how it looks bad for you, couldn't notice it from the screenshot you attached in the first post.
I think at this point the best way is to send a feedback using the feedback button on Edge. press Edge's (...) menu button => Help and feedback => send feedback
you can then click on attachment, go to recreate my problem, start recording, and while it's recording, reproduce the problem again and send it.