Jaki - if one covers the snaps of the other, you just stretch it out a bit through the leg elastic, then they sit more snugly. After a few washes, they'll be perfect. I had the same issue.
You can buy my AbbyGro if you like, I'm not a huge fan, wouldn't buy another one. It's not a slushie though, just lime green and red minky.

Thanks heavens for QLD sun! Our nappies are out getting de-panadolled - it's gross! I'm sure the microfibre on my GF will never recover!

WONB: AbbyGro