Yes, we did resolve this. Make sure you've cleared your server cache as the changes are in the js files.
I did a quick check, in your site the carousel is missing both in safari and firefox but in our RTL demo it appears.
check http://wplms.io/demos/rtl
Also refer below screenshots :
https://prnt.sc/qz2lkr
https://prnt.sc/qz2m6c
I will need to extract the flexslider and share updated wplms.min.js file with you.