Multiple Sealers in a large rum usally crash, I tried to seal a room with 9 sealer in a 10*10*10 space around each sealer, then my save was gone, I had to MCedit the sealersI just got the newest version today. I am certain only one galacticraft is in the folder. What do you mean by weird? I would attach them to 2-3 oxygen collectors and the moment a third sealer was setup it crashes. Each sealer gets its own 2-3 collectors.