strange change in color

[q-nq-r]

hi, i have a website and i wanted to integrate nightbowl to it to be able to add darkmode. Since i have to less time to actually change everything i found this tool very nice and helpful, however and this is my problem, the images I added to my website as background images so that i can add cool effects now look like they are just turned 180deg with changing the hue which as i said looks terrible. I did some troubleshooting and found out that if i just add the image normally with <i.mg src=....> instead of with class and then saying .bgimg-1 {
background-image: url(pics/environment.png);
min-height: 100%;
}
that the img does everything fine, so its not about the image.

and i just saw that my navbar that was fixed after scrolling down. now its not there, why could that be?

what can i do? and thanks for your time