I've only had this happen a couple of times and it was because I was trying to shove the cup on too hard. I'm used to the footballs and pool noodles which needed that extra push to ensure nothing was going to fall off. This doesn't seen to need that.
Thank You for sharing with All of Us I been Looking for a Spinner this one I like & it will do the job With No sound !!! Yay A little Pricey tho Wish the Company would have give a Discount Code lol