Preset browser not working properly for oddity vst .pbk files

Im using cubase 11 pro and have recenly purchased the oddity vst instrument from geforce as it was on special offer. For some reason the file browser isnt seeing the .pbk files that contain the presets. There should be around 1000 presets, I can only see around 70 in the dropdown. If I select load preset cubase shows nothing despite the .pbk files being in the correct location. Is this a bug with cubase ?