PowerModels currently remarks all load buses to generation buses if there is active generator located at the bus. That is different from the behavior that the PSSE does for the same raw file. As observed by my self, the PSSE simply ignores all generators at load buses. That is, they inject 0 active and reactive power into the bus even if their setting is different from zero.
I’ve made pull request that fixes this, but someone needs to confirm and review it before the merge. The pull request is stalled for 2 months now so I have decided to ask for help. Pull request.