I am installing St. James laminate flooring. As I work across the room some end joints start coming apart, why?

Some boards are so hard to tap the end joint into place the bar damages the tapping end, is there a reason for this?

There appears to be no damage to the tongues of grooves of these boards and they have been stablized inside over 48 hours.

This getting fustrating.

They need to be locked. What you do is cut a piece of flooring that has a click lock end and a flat end. Put the click lock end on the piece you are joining and tap the flat cut end until they lock.