I agree.
The seal has probably gone bad on the toilet. If this is so, it should be replaced as quickly as possible.
Ours was leaking slowly for years and we didn't know it. My DH went to redo the bathroom floor and there were 7 layers of soaking wet floor under the linoleum. It was absolutely disgusting. It had been leaking long before we moved in.
Luckily, the bathroom walls and rest of the house are plaster and held up really well against the mold and mildew on the bathroom floor.
Our son was diagnosed with asthma and had a lot of breathing problems. He has not had one episode since we replaced our floor. We think he had a mold allergy and was having almost constant reactions to what was on the floor.
In any case, no matter where the water is coming from, it should be dealt with promptly before any mold can start to grow.