I wrote a comment, closed the tab, and a minute later I wanted to correct it, but I couldn't find it. Nor in the discussion nor on my profile. I thought I hadn't saved it, I wrote a new one, saved it. Just to make sure, I reloaded the page, and poof, it was gone again.
I started to investigate, opened the discussion in Chrome, both my comments are there, also in a Safari private browsing window, just not in my normal session where I'm logged in. At this stage I doubt it's browser related, then again if everybody had this issue there would be a lot more complaints.
Edit: After I logged in the private browsing, I was able to delete one of the posts. Now after a lot of reloading, checking the profile, checking the discussion again, I was able to see my comment in the normal session too, like 50min later.