Hello,
I don’t see problem with the gallery https://gyazo.com/a81934b622e7e08a019450a1906c878d
But I found that you use cache plugin and this could be the reason of the problem because WPBakery uses the Ajax to call grid elements. Contact cache plugin author, they should have the solution for this because somebody already asked about this http://prntscr.com/o4i2bk
Regards