DAE's Colourpop matte/satin liquid lips separate in the tube?

I have a handful of colourpop lippies in matte and satin variety and they are starting to separate in the tube. It doesn't seem to be any particular type of finish or colour. I thought at first it was because I accidentally left a few in mg bathroom (which has shitty ventilation and gets super hot) but then I realized all the ones on my vanity (bexroom) are doing the same thing. I've only had these for maybe 6 months. Is this normal? Bad batch? It's really hard to stir/shake them but they go back to normal - temporarily - after that.