Unfortunately, without images from your code or website, it's difficult to determine why your image is not responsive. One solution could be to create a section with .container-fluid so that it has 100% width and is responsive. Then, adjust the CSS for the box containing the image like this:
example:
.box is the element where you want to use your fixed background image.
.box{
background-image: url('image.jpg');
background-repeat: no-repeat;
background-size: cover;
background-attachment: fixed;
width: 100%;
}
- This suggestion may or may not solve your issue, but it's worth trying. If not, consider exploring other solutions or providing images next time along with your code or website. :D