HTML validation problem: stale code picked up by the validator

I am using your HTML validator on pages of the web site
https://www.stanq.com/ The problem reported has been observed with pages:



dosbuttons.html

sid-change.html

vmsadmin.html



After making changes to a page I attempt to validate it and find the
validator is checking the code without the recent changes applied. When I
change https: to http: the modified de is checked; when I change back to
https: the old code is checked again. The same server (GoDaddy shared
hosting) is being used for both http and https.

This problem is very persistent (repeated tests show the same behavior).
Eventually (often hours later) the https: validation will begin checking
the updated code.



It seems like a caching issue; however, it occurs even when I have not
validated the page for many months before making the changes.



Do you have any ideas what the cause might be and/or how to work around it
should I encounter a situation when changing the protocol does not work?



Thanks,

Jerry Eckert