Question for clarity

Okay so I have a question regarding faction land control.

Faction A holds a solid 5x5 block of land (this is 5x16 blocks by 5x16 blocks), then a building gets constructed on that land. Faction B comes along and claims a couple of chunks within that block, (which also contain part of the structure), and faction A doesn't discover it until the next morning when logging back online.

I'm assuming it's legit, but my question is what's the smaller faction to do about it since they can't over-claim the lost land (due to not having enough power)? Is this considered an attack, and if so, since the claiming member is absent from the game at the present time, how can I go about reclaiming it since obviously I can't resolve the conflict and I'd rather not have part of my structure on land that was essentially stolen from us?

mark your chunk borders and know where your building on and you should not have any problems. just dont build a structure that is partially projecting outside of your faction chunks. if faction A does lose a building like this then it would faction A's mistake and if they are unable to claim it back for whatever reason......well thats about the end of the line really

This may be late, but chunks are 16x16.

Yeah, no I wasn't 100% sure how the faction mod worked at the time. Found out by dieing you lose faction power and thus can have your land claimed if curr power < claimed land.