/house problems

Please fix this :I
I can’t make a /house add
I can use the commands and all but… When I use /house add
It says I have too many houses
even tho I only have 1 :I

+EDIT
I deleted my only house so I can use it now (Still I do not know why I can only use 1)

Rofle or any Admin can you help me put a /house at the Plot 1 I bought at spawn?

it is protected anyway… is it not?

I am part of the region now since I bought it.

Guests and members and people kept coming inside even if i blocked the entrance :I that’s totally trespassing