On two accounts on the same battle.net, doing Goblin on both accounts at the same time. Both toons are in a group with someone else (not sure this matters). Looked at total stone count for both toons and it was 76. Tried to move stones from one toon to the other and it said can’t do it because the toon is logged on. I left the two toons in the same party, and logged off of one toon. I was able to transfer all the hellstones and had 76 on the one conducting the transfer, but the other toon’s hellstones appeared to not deplete on the screen, so I tried it again and it appeared to give me the hellstones a second time and then zero out the offline tons hellstone count. I ended up with 114. I then did the same thing again to test it after the next Goblin event. Same process. Tried to transfer the hellstones while both toons were in a party and both logged on. It errored. I logged off the same toon again, leaving them both in the party and was able to transfer the hellstones twice, again.
Bottom line - I’m able to pull the hellstones (Hell Stone Shards) over twice from an offline too to another toon when they are in a party.
It’s repeatable.
FIX IT!