<p>Its probably not all that surprising.<br>
First, LORs usually are bland instead of negative when the writer is not enthusiastic. LOR writers do not want to state explicit negative comments that could get them sued at later points if the letter was made available (even in a redacted state) to the applicant.
Second, LORs are usually provided by individuals who are friends or supporters of the applicant. These LOR writers from Boston likely thought that helping Dr. Bishop obtain a position at a lower tier university would be advantageous for all involved.
Third, UAH may have been happy to obtain an individual with a doctoral degree from a first tier university. UAH may have taken ho-hum or friendly LORs as indicators that Dr. Bishop was not a star or competitive for a faculty position at a first tier university but probably wouldn’t think that these comments indicated psychological problems! They may even have taken the LORs from non-Harvard sites as indicators of her greater reputation in her field</p>