The jumping header in Divi is a well-known issue. It happen when divi website page load.
In this post, We will show you how to fix Divi Jumping header in WordPress. I do with the help of custom CSS.
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Fix Divi Jumping Header
To fix divi jumping header you need to add below css code into Divi > Theme Options > Custom Css
#page-container {
padding-top: 100px !important;
}
#main-header {
top:39px !important;
}
Note: This is Code may not work. You Can adjust padding according to website header and check website without login.
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My Header and Setting

Below is my website header “Menu Height“. You can adjust it also according to website.

I hope you fix this issue but If you have any questions please let me know in the comments.