I assume you have a modern compact cistern that probably has an economy flush facility?
I have very little experience of these. There are two possibilities - firstly the water level could be too high due to a leaking inlet valve and the water leaking into the bowl is from the internal overflow.
A friend has recently had one of these fitted to economise on water but it soon developed a constant leak into the lavatory pan. I checked the water level which was ok and then she called out the guys that fitted it - twice! The first guy took it apart and could find nothing wrong so put it back again and when the leak had stopped went away. The next day the leak was worse and so another guy arrived and did the same but in an effort to justify his existence replaced one small fibre washer and one small O ring even though they appeared to be ok.
The leak stopped and to date has remained stopped. Clearly that type of cistern needs to be assembled very carefully with the sort of precision not typical of plumbers or plumbing.
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