Owl Carousel displays the same image on two lines

Hello,
I use an album “responsive album layout” (page “Galeries” of my site) who call many gallery “owl carousel” (Enable Auto-width,image size with no crop,real size image,no captions,carousel stage=1,loop and autoplay when there is more than 1 picture,pause=no ,2 second, no advanced options) , and the first time i see the gallery , images are on two lines, .. ??? when i return on the same gallery it is ok …I see this problem with Chrome and Safari, not Firefox, ..
Where is the problem ?
Thank’s very much of your reply..
I join the link of my site
(https://bequieartiste.com)