@Goku
I saw you had this problem with jb_snow aswell (probably with all maps with a low gravity area) - the gravity doesn't reset at roundstart (on our server we got a plugin which resets gravity at roundend)
I bet if I would cover all spawnpoints with a gravitytrigger with normal gravity they would spawn in there and lose the low gravity
Except someone of you know another solution - im sorry already for all this trouble
*Edit - sidequestion , do you have dice on your server with lowgrav ?
*Edit2 just tested it - once they spawn in the normal gravitytrigger they keep it - I'll release jb_moonjail_v1 in few hours
and sorry again for the trouble
*Edit3 jb_moonjail_v1 uploaded - feel free to test it again - and sorry once more xd