Hi, I suggest checking if the project is not far from the origin. If it doesn't help, I kindly ask you to reach out to us at firstname.lastname@example.org and send the affected model. We'll do our best to resolve the issue.
Please contact our Technical Support Team at email@example.com and send an affected Hyper-model and the relevant Archicad project in .PLA file format. We'd like to investigate this issue further and provide a solution.
The legacy app is an alternative, however, it'd be great to find out why this issue occurs in the renewed Android app (FYI, we just enhanced its visual quality with real-time shadow casting).