Oh! okay... I figured out the problem.
For some reason there must be a glitch in Map Maker where sometimes you cannot save the X, Y, Z coordinates under Destination Position. So what has to be done is that you have to go to YourMapNameGates.cfg located in your map's folder in media > terrains.
at the end of the script/code, there's: 0 0 0; 0
Type your coordinates in there.
If you have arrival yaw (which direction you look at with the camera when your char spawns), keep the semi-colon and type the arrival yaw coordinates replacing the 0 at the end then save.
please lock! thank you.