This could be from a few things:
● Nail beds are naturally smooth, preventing good adhesion. Use a course-grit nail file to gently rough the nail surface before applying strips
● The nail beds were buffed with a polishing buffer instead of a course-grit file
● The strips were left overhanging the natural nail length. Ensure to trim and file down the strips fully to align with the edge of the nail during application.
● The strips were exposed to sustained water exposure shortly after application.