image alt text missed in some cases

This is happening to my site as well. Some photos I can add and the alt text appears, but others do not. I’ve removed/deleted and added back but no change. Otherwise, all seems to be working properly.

OOPS! Correction. The text is there, but at high side of screen. I adjusted screen size and all is well. Sorry for any confusion.

In my case the alt text is really missed.

Now the plugin on our site is set to the Lightcase script. This premium extension to the plugin is displaying the alt text also by itself, so when Responsive Lightbox is set to display the image alt text, the alt text can be seen twice. Surprisingly, Lightcase do not have any problem with our gallery, so the alt text can be seen twice on photos where Lightbox is working as expected, and only once where Responsive Lightbox is missing to the alt text.

Can be seen at:
https://www.kvalix.hu/kvalixrol/galeria/