I NEED HELP ASAP

as far as the wrong ball size it's pretty common on travel trailers to have a 2 5/16 ball size that's what the trailer called for and that's what I had on

Unless your coupler was so far out of adjustment that it simply was too big for the ball, you likely had what's known as a "false hitch". That's when someone snaps the coupler down thinking it's latching around the ball and it's not.

More common than you'd think, and more so among experienced RVers that sometimes tend to get complacent about such things. Best to check for true couple by using the jack to attempt to lift the tongue after coupling is complete.

But like a previous poster, not sure how this helps since it sounds like you've already had some sort of catastrophe...

well like I said I have experience doing this I know that it was on the ball properly Keystone and Lippert both have recalls I'm similar trailers for this happening it has something to do with not enough indentation on the front of the hitch

Two causes
Mechanical failure
Operator Error

Sounds like 'operator error'

I had this happen with a small utility trailer that I had not "seated" properly on the ball. How does this help?

One thing that comes too mind is that you didn't have it all the way down on the ball or the ball was too small for the hitch and it poped up off. Probably the later.