Page anchors disappearing when I edit text block elements that contain them.

Hi, I’ve been creating page anchors using tags like: . For instance on webpage example 1 below, when you click on “Why we are better” on the slider, it successfully links to an anchor lower on the page. When I click to edit the text block element, the anchor stays there, as it should.

On the webpage example 2 below, I do the very same thing. Here’ I’m linking from the drop down submenus to anchors on the service page. The only difference is that whenever I click on the text block element to edit it, the anchor code always disappears.

For example, when opened to edit, it will automatically convert to “av-special-heading-tag” and then no longer work as an anchor if saved.

It’s not doing this on the homepage anchor. It’s very frustrating. Any idea how I can avoid it doing this? Thanks so much!