Yea mine has the same problem pretty sure it is not waiting long enough after looting before it tries to harvest just out of time to mess with it atm.
I will look at it more tomorrow night.
If you want to test something open up your B-Bot script and go to the harvest function.
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if ((HarvestValid = 1) and (HARVEST_MOB = 1)) then ' If harvest and Valid Harvest mob are true do
sleep 1000
VGSEndText HARVEST_MACRO
sleep 200
Change the Sleep 1000 to Sleep 2500 or so see if that fixes it.
This would be the first thing I would try.
I went through from release 1.1 to 1.2 and lowered most all of the sleep times to speed it up, this could be the problem.
If your using a BloodMage you might want to try the 1.3 stuff it is faster.