Hi Mahesh,
currently I am building the WebSite with MAMP locally. Therefore I have no URL for you to check the problem. But it is quite simple to reconstruct the problem.
Change in “Color Options” in “Header Color” “Header Background Color” color. Buttom leftmost. The contents of the middle box will change from “#transparent” to a different value. Now the formerly black background of the header is in the newly defined color. But the header background is now always visible. Even before the scroll up.
Now try the undo. Clicking on “Default”. The middle box changes to “#transparent”. But the header background will be visible. Even before the scroll up.
I hope you can understand that with you.
Best wishes
Rolf