The water in my toilet bowl very slowly drops minutes after completing a flush. The water in the bowl won't completely empty but it does drop cconsiderably lower than right after it was flushed. It has me a little puzzled because there isn't any leak anywhere around the bowl or tank and the water in the bowl does eventually stop dropping after a while. I installed a new FluidMaster Flush Valve & Flapper over the weekend but that didn't fix the problem.
How do I get the water in bowl to stay at the height it's at after flushing? Am I relegated to purchasing a brand new toilet?