POSTS section of mod page is messing up

[HadToRegister]

If you make a comment on a mod page, and then edit it, there's a good chance that part of the post will go completely missing or get cut off, as if there's a character limit.
If you try and fix it in the forum view, then the post shows up in the POST section of the Mod page with all the extra baggage from the Forum view.

EX: I make a post in the POSTS tab on a mod page like so.

 

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse sed lacus tristique, facilisis tellus vitae, consequat quam.

 

Then I decide to add more to the post, so I EDIT the post so now it's like this

 

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse sed lacus tristique, facilisis tellus vitae, consequat quam. Sed eget massa eget purus bibendum ultrices quis et lorem. Nunc dictum ornare dolor. Donec nisl arcu, pulvinar nec mauris malesuada, euismod ullamcorper purus. Donec dignissim quam sapien, ac suscipit nisi commodo at. Fusce id nisi ac nibh iaculis scelerisque ut mattis urna. Vivamus rutrum semper lobortis. Donec ullamcorper consequat lacus eget porta. Nulla interdum consequat velit sit amet rhoncus.

OK, fine, now I go and do something else, browse the site, then realize, I forgot to add something to my post, so I go back to the mod page, find my post, hit EDIT and get this

 

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse sed lacus tristique, facilisis tellus vitae, consequat quam. Sed eget massa eget purus bibendum ultric

with no way to access all of the other stuff I added before.
If I go to the Forum view, it's all there, and I can edit it, but when I do, then when I go back to the Mod Page POST tab, I get all the extra added Forum formatting along with the SPOILER button and the Quoted part of the other posts I'm replying to" which really messes up the POSTS Tab on the Mod page.

Any ideas what's going on? Using Firefox Quantum 64 bit 59.02