I've managed to narrow it down the other day. It happens when you have super/ultimate/or whatever the other powerful bot is called bots in your server.
The thing is when you have them set to idle, or where they don't attack you, and you hit them with a beam dead on. Normally they'd just tele away or use their super bot laser to block the beam. But once you kick that bot, or all bots(not sure, only tested it with one bot), the problem goes away.
So that's my fix, just kick and re-add your bots.
I'm going to go see if it happens with random and/or custom bots.
brb.
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I've figured out.
So with random and custom bots, no matter how good or bad, if you hit them with a beam, nothing happens, they just get hit and lose health.
However with Super/Mega/Ultimate bots, you can't hit them, even when they're totally idle. the beam just explodes right before hitting them.
So when one of those bots, or presumably any bots that get up against the skybox wall( i.ethe end of the map) they can teleport themselves out of the map, or into the skybox so to say.
So once that little glitch happens, beams get glitched, and well, just explode in your face. This goes for balls too, big bang, finish buster, etc etc.
Well there you go. Don't pin your bots up against the skybox and this won't happen, and if it does, kick that bot.