Button validating outside its validation group.

Hello,

I am currently having some issues with validation groups on a button I have in a child interface. I will be referencing the picture below.

The Save button on the bottom right has validate set to true, and is in the validation group "save_1". The fields "Expected Effort & Expertise Level" and "Total Payment Amount" are set to required, and are also in validation group "save_1". The whole section Organization Details is in a child interface, and the Section Add Participant Search Criteria is part of the parent. When I click the Save button, the fields from Participant Search Criteria are also validated despite not being in the validation group.

I understand this can be avoided by placing them in a separate validation group, but that forcibly removes the asterisk (*) from the field which is unwanted. Am I possibly missing something about the validation group, or am I out of luck?

Thanks.