I have created a SharePoint subsite and applied a custom theme to it. The page looks good until I publish it. After it is published, once I refresh the page, it quickly toggles to a default blue theme.
The theme was created using the custom PowerShell script as below,
$themepalette = @{
"themePrimary" = "#e81a2b";
"themeLighterAlt" = "#fef5f6";
"themeLighter" = "#fbd8db";
"themeLight" = "#f8b6bb";
"themeTertiary" = "#f1707b";
"themeSecondary" = "#eb3342";
"themeDarkAlt" = "#d11726";
"themeDark" = "#b01320";
"themeDarker" = "#820e18";
"neutralLighterAlt" = "#f8f8f8";
"neutralLighter" = "#f4f4f4";
"neutralLight" = "#eaeaea";
"neutralQuaternaryAlt" = "#dadada";
"neutralQuaternary" = "#d0d0d0";
"neutralTertiaryAlt" = "#c8c8c8";
"neutralTertiary" = "#595959";
"neutralSecondary" = "#373737";
"neutralPrimaryAlt" = "#2f2f2f";
"neutralPrimary" = "#000000";
"neutralDark" = "#151515";
"black" = "#0b0b0b";
"white" = "#ffffff";
}
Add-SPOTheme -Identity "ThemeName" -Palette $themepalette -IsInverted $false