Toilet doesn't fill all the way up after flush
I have a 2 unit bldg and the toilet in the 1st floor apt doesn't fill all the way up after each flush. This has been happening for quite a while now (like over a few years). In addition to that, my tenant just call today and said there's water leaking from the bottom of the toilet. Now I know the water leakage is probably related to needed the toilet wax ring replaced, but what do you think is causing the water to not completely fill up in the toilet after each flush? As a note, approximately 2 or 3 years ago I replaced all the parts in the tank because I was having an issue with the water constantly running in the back of the tank. Do you think this is all related?