ANOTHER TOILET BOWL WATER PROBLEM!
Have American Standard 2 button flush toilet's installed in bathrooms.. one operates fine.. the other one flushes and fills Ok, but after a few moments I notice the bowl water level has dropped about an inch.. how can I rectify this situation.. other then the water drop it works Ok...

Try this. Take a bucket of water and empty it into the toilet bowl slowly. Now watch and see if the level goes down. Let me know, Tom

Filled bowl with water as you suggested.. did not cause flush but level did go down slowly...