Thanks @Azura Skyy for the reply, It appears to happen if I create a map which has dimension lower than 100x100, eg. 20x20, 15x20,.
recently I tried to create another map, in this instance a larger one 200x200, I divided it into smaller event map.
The problem that I'm having now is I can't seem to teleport to the other coordinates. I'll put a video link into it.
Edited:
Attached a picture of the map I'm currently working on,
Just an overview, *Rsw,Gat,Gnd are all updated on my Grf.
whenever I try to use command"warp eventmap, I'll get teleported only between 1 and 3, never I have landed in 2 and 4 even I have walk-able gats