Yes, books get dropped/hurt. I would point it out to the clerk when you turn them in. They will know you had it since you will be turning it in and they will be clearing it from your card at that time :-) They will not take your library card or "punish" you in any way, it is not like at school/when we were younger and just learning!

I often get multiple books on a subject, one needs a lot of views, opinions, or information and one needs a lot of novels since they can be so quick-reading.