With film negatives, it often happens when the last sprocket in the negative strip is cut through (due to the nature of the film), the last digitized image is blurred in the last third of the image adjacent to that sprocket.

After scanning hundreds of negative strips I took a utility knife and cut off the end "teeth" that snapped the strip holder shut

The thing you need to remember is, make sure your film negatives strips are aligned in the guide, and that you have them properly aligned.

This machine will read negative strips but not slides --- what can I do ….?