@"Keane Xavier" said:
What I believe my question boils down to is this: how much influence does the university from which one earns their undergraduate GPA exert on the number itself?
I think you're safe just calling the university where the test is given to ask about construction, since they're not necessarily the "test center supervisors." But, LSAC is so strange, so who knows.
Does your admission ticket have a room number? (Mine does). If you're close enough to the university, could you make a trip over and check it out yourself?