Slide In plugin, at times it at times it doesn't?

It is a nice plugin, I must say but like all other plugins still need to mature as a matured wine.

It looks fine but at times it doesn't show at all when I open my site.

and another thing...I don't know what should I expect from this plugin when I have more than one slide-ins available or created.

The way it behaves I couldn't make out - 'yes' this is what it does when multiple Slide-in are available.

Kindly help