Thank you (whoever that may be) in advance for any advice you can offer. I truly appreciate any suggestions you may have in helping me get to the bottom of this.

When I flush my toilet, air bubbles enter the tank through the drain hole. I do not see any bubble whatsoever in the bowl, only in the tank. These bubbles result in the flapper being held open for too long and the toilet flushing once and then sort of "half-flushing" again. The toilet doesn't overflow, but then, I'm not putting anything in it when I flush.

Upon flushing, the bowl doesn't drain immediately... it fills up an extra couple of inches and then eventually does the one-and-a-half flush routine.

The toilet in the other bathroom operates just fine. Waste and all. It doesn't back up, there aren't any bubbles in the tank... it operates normally.

Blessings and thanks again in advance,
Brian