A lot of maps aren't working in multiplayer when I create, no idea why.

ex: judo platform, twinswords4, twinswords2, alleywayfight rooftop, and a lot of others.

you mean mods?
yeah, It happen to me too.....
It isn't very cool.........

I tried loading them as well, and it doesn't work for me either.
I heard of certain mods in which it's too easy to win fast being blocked in multiplayer to avoid farming, so this might be it, still, I'm not sure. If it isn't that, it's probably just a random bug and they'll have it fixed soon enough.

By the way, you mean mods, not maps. ;3

Ok ive had this problem before and i queried hampa about this.
I was uploading my mods and i couldnt load them.
I used to Menu>Mods>mod.tbm
Now i do
/set mod mod.tbm
/reset

Hope this helps.
Also make sure you uploaded them

Still not working even with /set mod... Me and my friend both have the mod and it still doesn't work. Oh, and what does "upload mod" mean?