One toilet sucking water from another when flushing
Two Kohler toilets (low profile, one piece) are installed back to back (powder room and master bath), sharing the same waste/vent stack.
The master bath toilet is equipped with a Kohler electric flush system. When flushed, if creates a powerful suction that drains most of the water from the other toilet's bowl. You can watch it get sucked down almost instantaneously, leaving only a small amount of water coming back up into the lowest part of the bowl.
Other than removing the electric flush system or redoing the plumbing, is there anything else I might try? I'm not a plumber, but am fairly handy.
Thanks in advance for any reply.