This problem is happening for many days. As soon as I finish writing my rp, I mention the person I am interacting with. But after that, the other person doesn't gets the notification. I have to inform through owl. Why is it happening? Also, I am mentioning it correctly.
Even, when others mention me somewhere, I don't get a notification. Why?

I- have gotten that same experience. The thing is, usually, for me, its when someone mentions me or quotes me, I don't get notified of anything I subscribed to. (ie OOC lets chat, threads, etc) other than intended. And it's odd, I thought it was normal, and when you're bringing it up, i'm beginning to think it isn't cause it started back when Cody got owled to be on the dueling team

I am having trouble getting posts to show up after hitting Submit. They no longer show in text box, but they don't post either.

That happened to me once or twice as well. Refreshing once seems to do the trick, they show up after that.

Checked some of your posts that contain tags and they seem fine to me. As long as the tags weren't added after the message was posted, we may consider this caused by bug. (Adding tags after the message has been posted won't notify the users.)

The mention must be sent at the first sending; during an edition, it doesn't send notifications (to avoid spamming people in case of multiple editions).

For the fact that you don't receive the mentions, check your remembrall setting. If it keeps happening, don't hesitate to let me know.