After you have your cold brew coffee setup, pour water through. The first 30 seconds of water pours will go right through. Examine if you're getting the medium to dark brown coffee color (if not, pour the watered down coffee into a temporary glass and then pour through again). If the coffee is too finely ground or too coarse, this can happen. If too fine, add/blend about a tablespoon of a slightly coarser ground coffee to the filter. This should even out the coffee grinds.
Keep pouring water and pour your first cup of coffee (will be the strongest). You can keep going until the cold brew coffee is weaker strength or turning lighter color.