How come the letter 'F' using 'Elsie' font does not show up on some web browsers?

I have used the font Elsie in a website built for a client in Wordpress, all the letters seem to work fine apart from just the letter ‘F’. On the Explorer browser and Mozilla, it seems to show up fine, but in a Chrome browser, the ‘F’ is missing, unless I add a double ‘FF’ in the backend of Wordpress and then it shows with the ‘F’ in Chrome, but then in the Explorer and Mozilla browser, it will show as two ‘FF’? Also the same as showing no 'F’s when viewing on an Iphone, but works fine on Android phone.

Has anyone come across this and have any suggestions?

Thank you in advance.