I suspect that the territory in question belonged to an orthodox faction, and therefore the loot option kicked in when the crusade arrived. Though to be honest, it sounds more like a bug, especially considering the amount of florins plundered. Mayhaps this incident belong in the "you know the AI is..." thread.
Nope it was 100% catholic. If it relys on running into catholic factions to atain loot why havent other people reported this in their games. it seems something of a rarity. especially the 130,000 bit..