Only map owner received graftblood

My husband and I just went through a hive fortress on a tier 4 cemetery map. Once we completed it, I (the map owner) got over 1000 graftblood just fine. My husband, however, got absolutely none. He only has 158 in his graft so he knows he received none of the reward.

He didn't die at all and never left the instance during and after the hive fight. This is only the second hive fortress we've done so far and the first one went fine (that one was before the latest patch). This second time was after the latest patch.

It's really discouraging if non-map owner players suddenly don't get graftblood. If we get another fortress and this happens again, I'll update the thread.