If the color isn't off, it looks like an awful lot of hop sediment to me.
Muslin bags (or any bag for that matter) are not perfect at keeping fines from getting into your beer and I'm sure you didn't whip up the primary and rack straight to bottles but...
Did you allow the primary/secondary to settle out before transfer?
Did you keep the racking cane off the bottom?
Did you transfer to a bottling bucket or bottle right of the primary/secondary?
In any case, crack one open, pour it gently into your favorite glass leaving behind the sediment and enjoy...probably nothing wrong with it!
Next time just take some care with your transfers!