u/Cultural_Smile9238

I need some advice about the gel polish from the gel bottle. This is the ordinary gel polish not biab.
I am using a rubber base with three coats of polish and their high shine topcoat. All of my customers nails are cracking with long splits on them after one week what am I doing wrong? I am unsure if I should only be doing two coats and if the coats should be really thin would this help? I have a brand-new gel bottle lamp so it is being cured properly for 99 seconds.