If you search the web on this subject there are a numerous complaints about this issue relating to numerous different websites. It appears that the default "encoding" may have been changed.
For older web pages viewed under Microsoft the suggested quick fix is to Right-Click; select "Encoding"; then select "Western European (Windows)". Sorry but I don't know the equivalent Unix/Linux/Mac or anying
Apparently if the webpage <META ....> contains the proper "encoding" (e.g. UTF-8) this eliminates the problem.
Hoping this helps at least some