Sorry, to ruin your party, but this bug is much wider than just the WM site.
A list of locations that go wrong:
about us in every site, excluding stackexchange.com and Stack Overflow;
work here in every site, excluding stackexchange.com and Stack Overflow;
- All meta sites are broken too, including Stack Overflow.
Stack Apps and Area51 are okay, so is mobile since it doesn't have those links there.
This seems related to a change in the company name and a move to Stack Overflow as the 'main' domain name.
I think ever site should redirect to https://stackoverflow.com/company/about and https://stackoverflow.com/company/work-here as they seem to be the correct ones.