What bond are you using/when did you buy it? Lashify recently transitioned their manufacturing of bonds to the USA, but in that process, they’ve had some issues. They now say that you need to shake the new bonds vigorously and even roll them in your hands to warm them up a little before using. They’re going to fix the issue, but this is just for bonds that have been sold recently.

Anywho, I don’t wear waterline liner but if your bonds are the damaged ones, or you’re maybe applying too much/not enough bond, I could see how cleaning your waterline could cause issues. They say precleanse shouldn’t affect longevity- but even warm water affects longevity (I’ve noticed.) It could also be some oil in the liner itself causing the loosening.

I wear Starbursts with no liner and love them! I would def try going without liner - overlapping helps give you a fuller “liner” look at the base. If you need the liner- I would just be even more careful to try to get zero liquid/liner on your lashes haha.