It basically means that your body isn't fully breaking it down, it's not really something to worry about as such, unless you think that it's making your symptoms worse ( a food diary might help you work this out) .
There are some foods that the body just can't totally break down, they aren't necessarily unhealthy, and if they don't cause you any issues then it's totally fine to keep eating them.
Since you are getting D and blood , it would be a good idea to let your doctor know about it, incase inflammation is having an effect on your ability to digest food and absorb nutrients.