wvw farming bug ?
wvw no longer gives exp so no use going there with upscaled( hope this inst true for eotm aswell). Its intended, not a bug.
To add what unrivalled said, you now get Tomes of Knowledge for ranking up in WvW which can obviously be used to grant yourself a level worth of EXP. Just hop on your main character, play WvW, and then spend them all on your low level character.
Maguuma Guardian