Okay, my bug3 is not me going crazy. I pressed submit on the previous comment, then after about 10 seconds with no indication that my buttonpress had been registered, my new comment appeared, with the new comment green bar (first I'm I've seen the green bar, see bug1).
Then, my new comment disappeared from the page. wtf??? Then I went back to the top and clicked on show all comments, and it appeared (in the middle of the page, thanks magic algorithm)
I thought that instead of everyone having to create a separate post for their first impressions, it would be more convenient to create a single post for this discussion. I'll post my own here soon.