CSS overwritten for background image

Hi guys

I just discovered a really weird CSS error and I have no idea why that happened. The background image is not displayed anymore.

My CSS is:

.footer_color {
    background: #ffffff url(https://test.com/wp-content/uploads/2018/12/Logo.svg) center center no-repeat scroll;
}

But for some reason the image URL is altered if I check the path with the inspection tool and looks like this:

.footer_color {
    background: #ffffff url(https://test.com/test.com/wp-content/uploads/2018/12/Logo.svg) center center no-repeat scroll;
}

Any ideas why that is the case and how I can fix this?

Thank you very much
Michael