[Question] Infinite Magicka?

I'm level 11 and somehow I seem to have infinite casting ability of my novice channelled spells. If I cast flames constantly, my magicka drains to zero then stays there as the spell continues to cast. Yesterday (and a few levels lower) it would run out and I'd have to wait a few seconds.

Magicka doesn't regen while I'm casting so I don't see why it would instantly overcome my spellcasting to make it infinitely long.

Any ideas?

EDIT: In case anyone comes across this in a search days, months or years from now. I just waited a few hours then quit/reloaded and it's fixed. It's NOT a feature.