Ladders!!!!

[Lindsey H]

Okay, I have learned to do Magic Loop and 2 circular needle knitting. When I am using 2 circular needles in stockinette I do not get ladders but when I am working in 1x1 ribbing I get huge ladders. What was weird was that when I switched from ribbing to stockinette I no longer had ladders and when I switched back to ribs the ladders were there again. How can I avoid this? I am pulling the stitch snug but do I need to pull even more snuggly when I am knitting a rib pattern?