Upload your definition with data internalized, so that we can take a look, quick! as fast as you can!
Don’t forget to ‘internalize’ your data.
Check point number 3 if you have doubts on how to do this.
PD: As a simple guess, I would check if the number of items is the same in both inputs: ‘PART’ and ‘GR’
Also, I would check that the format of the panel is OK with no errors.