Thank you for your post.
There could be a few explanations for the issue you are describing. In order to best answer you I looked to see if you are ordered with us. I do not see that the system would have been ordered through HairDirect, however the issue could be the following.
One, the issue could be over processed bleached knots, where the bleach expanded and bleed into the hair, creating the lighter area you are seeing. When done correctly, you should not be able to "see" bleached knots as it is to lighten the appearance of the knots to give you the most realistic hairline.
Two, it could be a process which is called recolor. With recolor blonde hair is knotted into the base of the system to create invisible knots. The blonde hair is then colored to match the rest of the hair system. When the coloring process is done, if it is not done closely to the base of the system it will have a light appearance like you are describing.
I would encourage you to call your supplier to see which process was done, and how they would be able to help you correct it.
If you have any questions please feel free to call us at 1-800-424-7436.
I hope you have a wonderful day.
Justine | Hair Replacement Consultant | email@example.com