When a few guildmates and I were going to invite Isaiah Blastbones to Partners In Crime today, we discovered that he didn't have a guild name under his name when we did invite him but when we looked at the guild list, it turns out we had 2 GMs.
Look at the guild list on the right side, as well as Isaiah's avatar on the right side, and that just shows how serious these bugs can get.
We tried everything. We even had a friend invite him to her guild, but nothing worked. He was still 2nd GM of PIC, until my co Guildmaster, Andrew, tried to invite him, and all was well, he was reverted back to a member.