First, postmodern, after a spurting start in the fine arts jumped into the social sciences with excess expectation.
Many thought that the postmodern era had arrived, and it was an ending to the predatory, exploitative, and unsustainable practices of the (late) modern era.
The jump into various social sciences resulted in the fragmentation (or continued fragmenting) of postmodern theory into competing, an perhaps incommensurate factions:
a celebratory postmodern that could not acknowledge the dark side of postmodern technology,
an aesthetic one rooted in surrealism, a postmodern science, a naïve epoch-shift ...