Wow, spot on! thanks so much @john1 for spotting this bug.
TL;DR: It’ s been fixed. It always chose probes from NL, now it chooses from the client side
Here’s what happened: you are right: all the atlas probes were from Holland, you can see them at:
So the students fixed it for us (thanks tons @Serban) and I pushed it today.
I just tried again with your server , and got all probes from ZA
See the RTT?
Now check the probes on atlas’s own site:
The URL for it is: RIPE Atlas - RIPE Network Coordination Centre
thnanks a lot once again @john1