Have you ever encounter a problem where the toilet flush over filled and the water over flow, drop on the toilet floor?
More likely the problem is due to worn washer. I’m have the problem and now I’m going to share the solution.
1) Buy the replacement washer.
2) Open the flush tank cover.
3) Take out the float ball to make you work easier.
4) Dissemble the inlet valve and replace the washer inside.
5) Assemble back everything and you are done.