I've noticed this problem too. It's been around for a long time and I haven't found a fix. I think that it's a problem with how the software interprets the CR and LF special characters, which are used differently on Windows and Unix-like systems. But we've never had any feedback or a fix for it (as far as I've noticed).
As far as I could experience, the issue happens from mobile only, on my PC (Win 10 1803, Edge) forum works fine except that it needs a long moderation time to show forum entries if you try to attach links or pictures.
The long moderation time is only due to the fact that there is only one moderator and it's totally understandable that they want to have weekends and holidays!