If you're using rye be WebGL format, there's a known issue w/ the Last Tile Finder not working correctly. If posdible, revert to Flash via the switch just outside the game, upper RT corner.
However, if on mobile, you won't have that option. Try going elsewhere in the mine to see if the LTF alters it's path.
If still no joy, create a SUPPORT TICKET:
Scroll down for support categories to begin the form.