It sounds like you're running into the bug described at Problem with select_multiple with ODK Collect v1.23.1 and v1.23.0 - #3 by Marco. We're working on a fix.
It sounds like you're running into the bug described at Problem with select_multiple with ODK Collect v1.23.1 and v1.23.0 - #3 by Marco. We're working on a fix.