When an item in the Term Navigator has more than a certain number of elements underneath, the arithmetic in the 'Need more items' dialog box is incorrect

We are loading in LOINC-based metadata. In selecting one of the items in our load where there are many tests underneath (in our case 8780 tests underneath LOINC Class/Laboratory Categories/Chemistry non challenge tests) then the browser chugs along before display a dialog box with the message : "The number of terms that were returned exceeds the maximum number currently set at 500. Would you like to increase it to 2500 so you can try again?" So OK, try again. The next dialog box is the same message except for "currently set at 1000. Would you like to increase it to 5000." Screen shots are enclosed in the attachment.