I would guess that that is just leftover stuff from the DME. Even with DME you will get some trub. It should not be very much though.
But, You did not say what type of starter you are making. If you do not have a stirplate your starter is much to small, or you need more than one vial of yeast for it.
For intermittent shaking using one vial, mrmalty.com suggests a 3.34 liter starter for your gravity. That is 14.12 cups.