Arm (Stay)- motion detectors setting off siren

Ever since the switch from the Classic to the new App, every time I set the status to Arm (Stay), motion is detected and will set off the alarm. Prior to the switch, only opening the contact sensors (doors/windows) would set off the alarm in Arm (Stay) mode.
How can I fix this? I have searched online and cannot find anything!

Open STHM, click on the cog in the upper right of the screen, select Security, and set up Armed (stay) sensors and deselect Use all motion sensors if set

Thanks so much; this fixed it!