It does not allow me to generate with partner model. It just shows firefly, once I generate few times with firefly partner model shows up, very annoying

Partner models doesnt show up when i try to generate , It only shows firefly in the begining and after few firefly generation partner models shows up, when i try to generate on a empty layer, there is no other models except firefly, once i generate with firefly and create new empty layer and try to generate then all models shows up, kindly fix the buy , very annoying. Thanks