Twitter card not working on specific domain



I am trying to figure out why the card in this location does not work

But a the exact same card in this location does?

When using the card validator, the response from the first link is simply “Internal server error”, not very useful at all. When testing the second link, all displays fine like it did before.

Please help if you canm this is rather important to the survival of my sanity.

Thanks in advance!