767 Overland texture

Hi Friends!I have a problem when i save my repaint for Overland/SMS 767-300ER model. I open the original texture and with GIMP i paint it. When i'm finished i save like a .bmp 32bit 888-8. (like the original)But the result .... :This problem appear only with the left side.. If i tried to modify the right side is all ok! O.oHow i can save the texture without problem? . Thanks to allEDIT: With FSX the same process are ok. I tried the same livery and the quality is very good!