They look very dehydrated and in desperate need of a good quality nail oil. All my clients have a good oil that contains safflower and tocopheral acetate amongst the key ingredients to ensure good penetration to the nail plate. I nag, nag , nag them to use it at least twice a day.
This client looks like they could have with a very thin, sensitive nail plate. Over buffing with a far too abrasive buffer is terribly damaging ( I use a gold buffer to prep the nail and remove the shine...a very high grade of gentle abrasion is all that's needed to prevent over thinning the nail plate.)
My rescue fix for the clients that may have problem nails is IBX, repair and strengthen treatment ( performed every 2-3 weeks until they improve ) and nail oil several times a day. Educate them to look after their nails and that will ultimately help you .
If it is just a few clients , then examine their internal health with a few questions??? do they have a new medical condition? have started taking medication? Have they got undiagnosed type 2 diabetes? or are they old with a delicate nail plate?
Close to the free edge of the nail is very thin in my opinion so it could just be that is all it is with dehydration and some damage from the removal process.
Hope that helps and it encourages you to not give up.
Rosie