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Unfortunately, I don't have DU KitKat on my N5 so I only have memory to go by. Could have sworn there was a quick tile for screen record. Have you installed anything new lately? I would try reflashing the ROM and see if that cures it, You can try dirty flash first, but clean flash if that doesn't work. Otherwise, I'm drawing blanks. Certainly never ran into that behavior myself.There's nothing to add in dirty tweaks. When I go to add things to the quick tiles, the only camera related option showing is the screenshot option. I don't see a record screen option.
When it's doing it, it has the camera icon (not the same one as the screen shot option on the quick tiles) and says "recording screen" and to the right it has a timer showing how long it's been recording. I can't pinpoint the starting time to anything different I've been doing.