If you add an EP field of the "Select" type and a user selects some values (multiple values allowed) than when that user wants to delete all of his previous selections and leave the field empty it may not be done. No error message is being shown and the submit gives a successful submission message, however that select field is still populated. A user may still delete all values and leave at least one, than everything is good. But if a user has 16 selections and he wants to delete all of them - the field will still remain populated after everything is deleted and submitted.