So am a newbie and experienced the same problem while dry camping a few weeks ago. Note the trip was out for a total of 8 days, first four were dry camping, last four we had water and electric hooks ups. Same CG, different sites.
The water pooled on the left side of the toilet but was DEFINITELY leaking from either the flush valve or hose that connected the valve to the shut off. Could not figure out a patter when and why it would happen. I tried to tighten valve/hose connection but had difficulty getting pliars onto the fitting due to the proximity of the wall to the back of the toilet.
Suggestions would be welcomed!