Can't say if it's Drupal/Subtheme/Basic/user-agent or RTL related

Would glad to have your take on this, though it is likely this problem has nothing to do with either Drupal/subtheme or Basic, and is much more likely to be associated with RTLness/user-agent or vendor prefix.

https://www.sitepoint.com/community/t/justifying-the-text-of-a-li-item/2...

If it's not suitable to this forum, please delete. I understand it most likely not to do with Basic (though I would be glad to know if you had that problem in English Basic sites at least in some browsers).