[tribulant_slideshow] Doesn't Upload Properly

I use WP 4.0 with a Zen Lite theme. The first slideshow I uploaded worked fine. The second slideshow I uploaded automatically had photos from the first slideshow. I deleted the second slideshow and re-uploaded it with the same result. Then I deactivated/deleted the slideshow, reactivated it and uploaded both slideshows with the same result. This is for a client of mine and is totally unacceptable. What can I do to fix the problem?