Version 4.1.6+ (Build: 20231013)

Moodle mobile 4.3.0

On the mobile app running on IOS go into a course and look at an assignment as a teacher. 

Tested with assignment version 2022112801 using upload file and text submission each.  Grade set to points and simple direct.

Click on Participants, Submitted, or Needs Grading in the list of students, click on a student to grade and you get "Error Invalid Response Value Detected"  If you click the Ok button or off the error message it will allow you to continue normally and sets grades as expected.  This happens for each student you click on.  Have tried this on multiple devices and with different classes.