Thumbs not showing after last page clicked

First time here. I have looked through posts cant find the answer.
When viewing site client area/(client set)the thumbs show on all pages if you use the last page button to go back a page the thumbs do not show without a manual refresh then sometimes not all show, next refresh the ones that show don’t and the ones that did not show now do. I am using theme “Pinboard” with the latest WordPress and Image Store. I have tried caching on and off, I have a separate template page for Image Store pages. Please can anyone shed some light on this?

Thanks