Ok, so making a new cache page didn't do anything.
The thing that made it work was removing the background image url! I don't know how, but removing that image url made it go to the actual page!
Thank you all for trying to help me. Apparently it was an issue with the background image.
For the first possibility:
When I go to the first step (Type & Location) it shows a popup that says Saved Draft, "Looks like you already started creating a geocache or event. Would you like to continue or start over?" I click Continue Editing" and the coordinates and the type are still there.
As for the other one:
I changed my prefrences so it became Mon/DD/YYYY as you suggested. Now the date doesn't disappear, but I still can't submit it.
I think I'll just start over and make a new cache page.
I do use the calendar. I click the date (June 5) and it shows up as Jun/5/2018
But then, I refresh the page or go to a different section and the date is gone.
Also, I did move on. I clicked the size, D/T ratings, and attributes
Then what's the problem? I have definitely made a cache page (see attachment) and marked the location, type, attributes, size, D/T rating, date (it's not on the picture but it is there), and attributes.