Anchor links between tabs not working in Safari

I have tabbed content and buttons that link from the first tab to other using anchor links. They work fine in Firefox and Chrome, but not in Safari. It looks like the page is redirected to the parent page. Could it be a redirection or .htaccess issue?
I tried several CSS things and adding name attributes. I tried links with and without / before anchor. Nothing is working.
The buttons in question are at the bottom of this page:
Any suggestions? Thanks!