I also had this happen. I think it may be do to lag issues but i can't be 100% certain. Usually happens to me in a busy area. But to comment on the bot issue, i have seen many of bots lately, but they're all under ground now and i can't target them to see their name for a report. But they have super bots now, they mine so fast, they don't have any delay when they mine, just 4 quick strikes then teleport to a new spot, then 4 more quick strikes and more teleporting. Honestly it's issues like this that makes the economy so horrible. They flood the AH with everything. A great way to see some bots is to check the crystals or shards. Some people on my server were selling like 6 stacks of 2,000 each. No sane person could mine THAT much