There was a thread before, trophies can't go above level 60. My suggestion for this would be like this: if the trophy level is 60 the progress counter would print out "MAX" or something like that.
Edit: link to a thread: https://iourpg.com/forum/showthread.php?tid=579
Edit: link to a thread: https://iourpg.com/forum/showthread.php?tid=579