Corner of backyard soaked?

the corner of my back yard is completely soaked. In the corner there is a retaining wall on the left and a fence along the back. i ran a french drain along the retaining wall thinking it was from that but no luck. When i was digging the trench for the retaining wall footing i think i hit the water table because the deepest end of the trench would fill with water slowly to a certain point then stop. i went a head and filled the trench with concrete and built my wall. That was 3 months ago. i now noticed after some digging that the concrete that the fence post is held in leaks water???? If i dig horizontal under the fench the dirt is completely mud. Does this sound like an issue with the water table or is it a drainage issue or broken sprinkler from the property behind me ? Also the wet soil seems to go more along the back fence the along my wall