When you're riding your mount, you can sometimes go past npcs for a second or two before the npc triggers the battle. When that happens, they'll sometimes go over the ledge after you.
I can't remember his name, but there's a scientist you defeat that has all of the eeveolutions standing next to a machine. In the same room, you go to the top left corner and that's where you'll find the Eevee .
I'm not sure if there's anything you can do, you'll need to have a staff member manually fix the issue for you. Hopefully they're able to roll your character back.
I don't believe you can put in attachments, however, you can upload an image to imgur. Once uploaded, right click the image and copy the image address. Select the "insert image" button and place the link in between the brackets.
Try connecting to the Red server to see if it's client/server side. If you're still having the same issue, delete your game files and make sure you're redownloading the correct files. Once they're downloaded, run the game as an administrator.