Word-break compatibility IE and Firefox

Hi,

I’ve been told that words are cut wrongly on Frirefox or IE. The first letter is alone at the end of the line and the rest of the word is at the begening of the next one.
I’ve change word-break and hyphens in the CSS editor but it didn’t change anything.
I need your help.

You can check the problem on my website with Firefox and IE : https://www.loeildeluciole.com
Thanks a lot ??