I think I might have found the problem. Because Armor Stands and Item Frames are entities (kind'a like peaceful mobs that don't move) with Entity-IDs rather than blocks with X/Y/Z coordinates, the plugin has to scan the surrounding area whenever someone breaks or blows up a block looking for armor stands and item frames and then looking up the database to see if someone owns them. That whole process is a bit of a kluge/bodge and sometimes got confused and prevented explosions when there is an armor stand or item frame in the vicinity but not in the range of the explosion. This is one reason I originally protected the armor stand itself, but not the block it's standing on. Explosions are no longer prevented in the vicinity of these entities. The plugin will try to prevent the entity from being destroyed, but that's not guaranteed.