Could you post a screenshot of where you're stuck?
Were at route 104 when I got stuck.
Now that I used an Escape Rope, https://imgur.com/a/uULUF
You're not using a controller, are you? That could cause you to automatically go up.
If not, make sure you don't have a key stuck. Open up notepad and see if it types automatically.
Alternatively, you can also click and drag to move your character. See if that lets you move.