Save/Load issue (c3p attached)

Hi everyone, I got an issue on save and load, ( c3p link below ).

Please preview the worldmap layout first.

When game start on worldmap, game will be auto saved.

Player click the yellow dot, then click[ yes], will enter the level layout,

then click [pause]icon on level layout will load back to world map's save file.

but when you repeat doing this 2-3 times, the [yes no] buttons won't spawn out anymore.

(same issue happened to my other project with enemy, they disappeared or game freezed after loading.)

I have no clue why this happened. Hope anyone can help me with it.

drive.google.com/file/d/1st9xWUxQLXPo4k-BNrhCcL9V56KHr6R6/view

Yea there are few dodgy things going on there and I cant get my head around what happens if you use load and save like that. You do realize it is saving and loading the whole game state when you do that not just the level?