Internal links/anchors on spec.filecoin.io don't open

[CluEleSsUK]

While reading through the specs on the recommended docs site, I was unable to follow any of the hyperlinks.

Opening e.g. https://spec.filecoin.io/systems/filecoin_blockchain and clicking 'virtual machine' changes the URL to https://spec.filecoin.io/systems/filecoin_blockchain/#section-systems.filecoin_vm, but the view does not change.

I had a try few most of the pages and external links work fine but not internal.

I tried on both firefox and safari to no avail