I know how the I2C display should be wired. I have been using them for years. What we need to see is how YOUR I2C display is wired and also to be able to examine the soldering. So photos of both sides of the display showing the soldering of the I2C backpack to the LCD and the soldering of the components on the I2C backpack can be valuable. We have solved others problems by looking at the photos. Try to make the photos clear and detailed.