empty (undefined) responses on some PermID web requests

Hello,

On the PermID website I am getting empty (undefined) responses for some, but not all, organisational PermID requests. Here are some examples of undefined responses.:

Hellenic Broadcasting Corporation ERT SA : https://permid.org/1-5044174690

Athens News Agency Macedonian Press Agency SA : https://permid.org/1-4296853311

Antenna Group SA : https://permid.org/1-5000787529

Interestingly these work fine via the API (e.g. https://permid.org/1-5000787529?format=json-ld) ) and the headers show that I have plenty for requests remaining.

Any guidance greatly appreciated, thanks.