Hi,
i am sorry but i don't see any problem.
If the scroller is not necessary, it won't work which is normal and more professional way.
Scroller is meant to work when there are more thumbnails than what appeared.
If the thumbnails are less than 3, then scroller is unnecessary, because there is no way to go further with scroller.
If there were more than 3 thumbnails, then the scroller would start working.
Regards.