Hi - I had a leak with my tank gasket and took steps to replace all tank hardware and the gasket. That leak has stopped. However, when repairing the tank I noticed the toilet was out of level and dipping towards the front. I added shims to the front to level the toilet (there were some visible on the back already). It took two shims stacked in the front to get it to level. I loosened the bolts on the base to allow some play for the bowl to move while leveling. I then tightened them both back once leveled. I am now seeing a small leak at the front of the toilet after use. What could be the cause of this based on what I described? Thanks for your help.