My photos look off when in the previews

Everyone is suggesting that all I need to do is go back and start over. I have the pictures exactly as I need them. When I use one picture as a hero it is foggy yet when I use it as a picture just placed on a totally different page (in the same file with the same settings) it is perfectly fine. All I'm essentially asking is "is it because it is being used as a hero image? And must I honestly go back and change things in the original file in Photoshop, because that would require a long time of tweaking to make it look how it is supposed to?"

Are you seeing something like this?

Design view is not color managed (at least not on Windows), and images will display over saturated on wide gamut monitors.

Live view, and most web browsers (except Internet Explorer and Edge) are color managed, and will display correct colors.

What is the make and model of your monitor?

And are you on Mac or Windows?

You will probably find it is just a visual glitch, as you said.

It may be worth checking your images actual size and compare that with the actual space it is using in a browser. If the image is not of a high enough quality, (or if you are using a hi-dpi monitor or device with a standard image) then that will also give you the problem.