Hey @Lorenmn,
Thanks for sharing your credential! To fix your issue, you need to set a fixed height in your header bar. For example 8em
.
If you are thinking that there will be a double scrolling issue when you set your header bar to a fixed value then you have nothing to worry about it, I already tested your website using the browser tools and the issue about double scrolling didn’t show up.
On the other hand, while I was checking your website, I found out that you added some code Pinterest code in your Global JS, which you added in the wrong way. This could lead to some issues with your website. To add it in the correct way, you may use this plugin.
Hope that helps.