I fixed it. I changed
b.pos(x, y + height, z).tex(u, maxV).endVertex();
b.pos(x + width, y + height, z).tex(u, maxV).endVertex();
b.pos(x + width, y, z).tex(u, maxV).endVertex();
b.pos(x, y, z).tex(u, maxV).endVertex();
to
b.pos(x, y + height, z).tex(u, maxV).endVertex();
b.pos(x + width, y + height, z).tex(maxU, maxV).endVertex();
b.pos(x + width, y, z).tex(maxU, v).endVertex();
b.pos(x, y, z).tex(u, v).endVertex();
. But I have another problem:
(I can't find button to insert spoiler in editing mode, sorry)
Another textures are also drawn.