Anchors broken and can't edit page

[Support]

I have multiple spaces & pages that have anchors, they all worked last summer, but now when I go to them I get redirected to a link like this instead of moving around the page:

https://....../wiki/spaces/byDraft/pages/edit/3035313

I am also unable to edit the page and save it to try and correct it. Save button does not work after I start attempting to make changes.

This is a MAJOR issue as now our guides are all broken and I am going to have to recreate them all.

Any help, or a fix for this, would be greatly appreciated!!