Hand Sanitizer Stations Emitting Chlorine

May not be a bug I guess, but seems weird it would work this way if so. I keep having chlorine appear around my hand sanitizing stations with no other place it could be coming from (no exposed bleach stone, no caustic biome exposed). These stations are not being actively refilled so it's not from dupes carrying bleach stone around (although it seems those have stopped emitting chlorine while carried anyway?). It just seems to be happening in the area I have 2 stations in, and not around the one I have on the other side of my base (I could be wrong, but have only noticed chlorine coming from one side).