Bugged House Expansion

My house has a bugged expansion, it is currently 49x49, however I have paid for a 50x50.

[spoilerHouse Size:1sad3kvt]

[/details]

[spoilerExpansion Costs:1sad3kvt]

[/details]

I think houses start at 0,0 on the top left and not 1,1, that way, instead of 50,50 it’s 49,49.