Only 1 Book Usable in Widget?

I have happily used this plugin for awhile, and feature several flip books on my site. Unfortunately, it appears that I can feature only one book through the sidebar widget … when I attempt to add another (on different pages), the first one simply disappears.

Is the plugin limited to only one page flip book in the sidebar?

Thanks for any clarification.

https://www.ads-software.com/extend/plugins/page-flip-image-gallery/