Tribute page, Zamenhof - feedback appreciated

Hello, here’s my tribute page:

Overall I’m happy with the result, but there’s one thing that I haven’t been able to figure out: to make the page a bit more colorful I decided to make each instance of the word “Esperanto” green via span elements. This works fine when viewing the page on my computer, however when looking at the page via my smartphone only the first span element (above the image) is green. Any ideas as to why?

Might be a cache problem? Esperanto is green on my end. Try hitting F5 on your keyboard.