k, i find i only have trouble with stitches that have been knit throught the back loop. I always have to unpick these ones, then it will unravel to the next tbl stitch, which i have to pick at, which is a pain.
I'm not sure why yours isn't unravelling, though, unless you've been knitting through back loops :shrug:
It's so hard to tell without saying, here pass it to me, i'll have a go. Sorry. What a task.