Premium Garden Soil/compost.

Have a large raised garden bed we've built. So far 4 cubes of soil to fill it, after the latest wet weather we've had the soil has compacted and we've found a lot of bark and mulch in amongst it. Is this just normal these days or are Dalton's just supply rubbish? I feel like it's not refined enough for growing carrots or similar root veges. We paid a fair amount for the premium stuff too so I didn't expect to see this much bark/mulch.