Custom CSS Background Color For Brine Theme Bug

Site URL: https://www.jackroland.net/

I am using the brine theme template on my Squarespace site and am experiencing a bug when using Custom CSS.

have installed custom CSS on my pages, and assigned them to different background colors.

When you enter the homepage, the background has the correct color background (orange). When you navigate to another page, the background is also orange, whereas it should be whatever I have it as in the custom CSS. For some reason it's bugged and you have to refresh the page in order to see the correct color.

I am using this code in the Page Settings 'Advanced' tab

<style>
.Main {
background-color: #F56626; !important
}
</style>

I have the following site-wide custom CSS as well:

.is-mobile-overlay-active .Mobile-overlay 
{
@media screen  and (min-width:641px)
{ 	  width: 100%;
  }

@media screen  and (max-width:640px)
{ 	  width: 100%;
  }
}

body {
  overflow-x: hidden;
}

.mobile-overlay-menu-main {margin-top: 50px;
background-image:url(https://static1.squarespace.com/static/5b2671457c9327b7540a6f14/t/5e8897ead4929f67dfe53f51/1586010091443/Jack+Roland+logo.png?format=750w);
background-position: top;
  background-size: 50% auto;
  background-repeat: no-repeat;
}
.mobile-overlay-nav-item {padding-top: 60px;}
.mobile-overlay-menu {width:100%; z-index: 1;}

h4 {
  font-family: Open Sans;
  font-weight: 400;
  font-size: 140px;
  margin-bottom: 1px;
}

@font-face {    
font-family: 'Equitan';       
src: url('https://static1.squarespace.com/static/5b2671457c9327b7540a6f14/t/5eb1d31defd917670c27f543/1588712221989/Equitan+Sans+Bold.otf');  }

h1 {font-family: 'Equitan';}
h2 {font-family: 'Equitan';}
h4 {font-family: 'Equitan';}

.white {
  color: #FCFCFC;
}

.forest {
  color: #4D6557;
}

.contact {
  font-family: Open Sans;
  font-weight: 300;
  font-size: 12px;
}

.pink {
  color: #EED4D4;
}

//---Custom Fonts---
.Header-nav--primary .Header-nav-item
{font-family:Equitan;
text-align: center;
padding: 0.7em;}

.Header-nav--primary
{font-family:Equitan;}

Does anyone have any clue why the color backgrounds are bugging?

Here are some screenshots.
1st image is the homepage
2nd image is the way the About page should load
3rd image is the way the About page actually loads

I resolved this question myself. 

It was because of Ajax Loading.

https://support.squarespace.com/hc/en-us/articles/115000253288-Ajax-loading?_ga=2.243168321.293081833.1588805565-1922224657.1561591562#toc-enable-or-disable-ajax

Hi there, how did you solve this problem? Disable Ajax or something else?

Thanks

@Troublemaker

If you're on a v7.0 site Ajax being on can often cause things not to update the way you expect. If you are having such an issue it doesn't hurt to turn off Ajax for a bit to test if that is the cause of the issue.