If these are image custom fields then I would expect in the custom field settings for your image custom fields under Yoast you would only see the image option or to exclude from Yoast (screenshot).
The options which appear will depend on the type of custom field and what makes sense for them.
Can you please check with Yoast and check with them first if this really issue from Toolset and if its from us - can you please share all details and I'm happy to escalate it further after I review and confirm the same.