Just real quick it looks like the code on the left is inside the blurb section, it seems to happen occasionally when switching layouts. Click the "blurb" header next to "HTML" and you will probably see the custom code there (you can delete it)
As for the second bug, would you be willing to DM the code to me? That sounds like it could be caused by a few different things and if it's a bug in my editor, I'd be happy to fix it!
Oh, thank you, I was able to get rid of the code on the side! For the other bug, yes, I don't mind dm-ing you the code. Just give me a moment. Thank you!
Ah, wait! That's weird, it seems to be fine now. I already sent you the code but I suppose you don't have to look at it anymore so you can ignore that dm since I can't delete it. Maybe it got fixed when I deleted the blurb?
oh, that makes sense. given that, I suspect it's because the blurb had duplicate elements with the same ID - so clicking the tabs was probably changing the sidebar instead of the main area 😂