Lookup field issue

Lookup field issue

I have a couple of lookup fields that record the business/institution and department of a contact, these lookup fields get information from our institutions (businesses).

For instance, I want to link the current university of a student, to that student.  

The problem is that when you're setting up a new contact and click the lookup field for the list of institutions, and click the correct university, there's no 'enter' button or 'save' button, so there's no way to complete the task and link that student to that institution.

It works if they contact is imported so that the field is populated, but not if the contact is added manually.