Tag stripping

WordPress.com keeps changing my HTML, I already saw almost all topics on the forum but still no solution; I’m trying to use anchor links to create an index for a post, wordpress keeps abusing changing their spots and repeating the links everywhere on the page, and yep I tried deactivating the visual rich without success, it changes as soon as I save, this is really frustrating, I assume this bug has been here for a while and I don’t understand why itsn’t fixed yet ??!!