Updating a Drop-down menu

[Tregeagle]

Domain name: www.rendleshamwi.org. A total novice to web-building, I successfully published the first two pages of this new site yesterday and was absolutely delighted with how they look!Today I have made minor alterations to both pages. The changes have appeared successfully on the main index.html page, but not on the linked page.The problem lies in a drop down menu which I put in yesterday, but have edited and extended today.The amended version shows up fine on my preview screen, but is still showing the old version on the web. I have deleted my cache (in case I was simply seeing an old saved page) - no change. I have also visited the site from a different computer and with a different login - the old page is still there.What do I do? Advice please.