ok Idk if this is just me but I replyed to an comment on my post then I went and replyed to someone elses post I didn't nothing wrong or anything I don't think and guess what my reply isn't on there it seems some of my replys r disappearing what gives?
I had that happen once or twice. I'm not sure what does it but it always works again later. Maybe it is a misskey or some such but either way, wait a bit and try again making sure you wait til it shows your post in the thread before you move on.
Try holding shift and refreshing the page, your browser's cache might not be updating after you post a message.