Hello,
I had the same problem until today and searched a bit for a solution. I found out from another topic about this problem that the 1/1 disappears when you deactivate and then activate the plugin again. So, first update it to the newest version. Then go to your dashboard – plugins – deactivate your huge it gallery. And then activate it again. With me, the 1/1 were gone after that. I hope it solves the problem for you too!
Ps. I checked it and the ‘show all’ option now works just fine where it first seemed stuck on the pagination option.
