Well first go into your script editor.
Then scroll until you see the Window_MenStatus script. Look on line 31 and 33 and delete whats there.
Which is
draw_actor_level(actor, x, y + 32)
draw_actor_exp(actor, x, y + 64)
Just delete those two lines.
Then go to window_status and go to line 26 and delete this line
draw_actor_level(@actor, 96, 32)
Then delete these two lines
self.contents.draw_text(320 + 80, 48, 84, 32, @actor.exp_s, 2)
self.contents.draw_text(320 + 80, 80, 84, 32, @actor.next_rest_exp_s, 2)
and finally delete these two lines
self.contents.draw_text(320, 48, 80, 32, "EXP")
self.contents.draw_text(320, 80, 80, 32, "NEXT")
Once those are all deleted, you shouldnt Exp or levels again.
If you do see it again let me know and ill show you how to fix it.