Can you show us pictures? If you have' nests' or areas that the stitches are not (stitches) on the back it might come apart when used/ laundered, should be fixed. It is Always a good idea to check the underside of the quilt when you stitch the first line of stitching ( I stop and look after going 3-4" when I first start) ensuring everything looks right, then get going; each time you change bobbins you should check again and if you stop for any length of time when you get going again. That way if there are any tension issues you catch them early, much easier to fix a little area then a whole quilt. I keep a 12" mirror tile on my longarm table. Every turn of the quilt, bobbin change or break/stop I take a look to see that the back looks as good as the top.