I have a custom object called " Deal Desk Form"that is a detail to the Opportunity object. We've just started noticing that when we go to create a new Deal Desk Form, it runs all of the validation rules on the Opportunity before saving. This is not behavior that occurs in any of our sandboxes, except for one which we refreshed and activated today. Is this new behavior that Salesforce deployed recently? Is it expected? We can't figure out why it's happening.
If you have any roll-up-summary fields on the parent object that counts the children, that will cause an update to the parent when/if you change the child. Is that the case?