i have a border where the texture seems to be missing, here is a screenshot

you can see that tree in the middle of nowhere
the map is 15x12
the size of my BMPs are :
tex : 7680x6144
height : 961x769
metal : 961x769
feature : 960x768
it worked before and somehow not it breaks
i tried recompiling, recompiling changing the texture compression rate nothing helped
can someone tell me why i have that "hole" ?