CRM field does not populate through lookup add new value

For our existing forms that had CRM fields...we can no longer select these fields when the CRM field is accessed through another form via adding to a lookup. I tried adding a new CRM field to the form the lookup referenced and the new CRM field populated the lookup's form. so it has something to do with older CRM fields.

Again this is not when selecting a CRM field in a form directly....but adding a value to a lookup field in a form through the plus button. We are having issues specifically with Accounts...I have not tested other modules. Please advise.