Error Displaying the Featured Image

Good evening,

as you can check here:

https://ibb.co/mDrUEa
https://ibb.co/gBAd7v

the featured image (gallery image) on the left side remains the same even if I switch to another color. The error exists only for colors of the first 2 lines, not instead for those on the last one:

https://ibb.co/mihmua

hope you can help me finding a solution to this issue,
Thanks in advance and kind regards,

THNK4