WHY CHOOSE US Background image not changing

Hi, I can´t change the background picture of the WHY CHOOSE US section. It still shows the dark “mercedes” background.png.
Every jpg or png I try to replace with is not working: Nothing is changing, the dark mercedes background is still there. My new image is shown in the “image” box of the customizer. But on the webpage and the customizer preview still the dark mercedes image png is there.