I have 299 WvW bonus chests
I also got this glitch, but it is far more extreme for me. I have 4,589 bonus world chests. I don’t know what caused it as I was logging onto my characters to get the dyes and skins and checked my wvw stuff afterwards.
I submitted a report about this as well. As much as I’d love to, I don’t think I’ll manage 17000 rank ups anytime this decade.