Anytime Strapless - Push-Up Bra

From all the same size and different models i bought, this one fits smaller, probably because it’s strapless. I think it lacks something to make it a good strapless (like rubber / silicon band to make it stay in place) cause without the straps it has a tendency to slip or make a gap in the top of the cups

Loose/too big cup and especially loose at the top of the cup.

Cups are stretched like it has been worn. I have already contacted Cherries about it