Lance of Longinus multiplied

Background: My Paladins - one of them carrying the Lance of Longinus - were fighting in my (human) opponent's territory, the Lance was used in the middle of the fight, then all of them were slaughtered; the relic was dropped. Another twelve Paladins were raised, came to the battlefield, slaughtered opponent's defenders and decolonized the zone. Then I send my Paladins for the relic (all of them selected) and... all of them picked it. Now I had twelve Paladins, each of them carrying one Lance of Longinus. Especially funny bug, since the multiplied healing ability of the relic (Miraculous healing) made them literally invincible (eleven peers were healing their brothers in arms simultaneously). You cn also note from the screenshot all 12 Lances are charging. The Lance simply multiplied.

Technical info:
1 - Mode: Multiplayer (duel, non-ranked)
2 - OS: Windows 7
3 - DirectX (default)
4 - follow the description to reproduce, I didn't play another game since
6 - seed unknown

*out of signs*