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Make sure you don't have it on Repeat action.
If you want a simple one time movement, you could make an Autorun event somewhere with a Set Move Route command on your player.
Then erase it.
If i make another event move it'll move when i dont want it to so i just put it on 1 event and make the rest move with the other ones, so i cant autorun another event and i cant do the set move route on another one
If theres nothing else in the event and it is either Parallel Process or Autorun it will, of course, repeat the same Movement over and over again, so make sure that you "switch" the event off before going to the next one.