Inconsistency in test results from different sites

[Cloudmaster]

Hi all,

When testing my site from Amsterdam NL - IISpeed, I get an F for cache static content. From London UK - EC2 I get a B or A.

Amsterdam
http://www.webpagetest.org/result/171124...c71266fd7/

London
http://www.webpagetest.org/result/171124...68b13f1cf/

Is this normal?

Thanks for looking