It could be product build up, maybe you could try a sulfate free shampoo to get rid of it?
3a, baby fine i/ii, low to normal porosity, protein sensitive
Mod CG since 5/12, from rainy Western WA
dislikes: glycerin, wheat protein
Likes: moisture, Mag Sulfate
Poo: Elucence Moisture Acidifying Shampoo
Cond: CJCR, VO5 Clarifying Conditioner
LI: JC WDT, CJ CR
Style: Loma Curvature Curvy Cream, True Polaris Protein Free Truly curly styling gel (Etsy), Sweet Curls flax seed defining gel (Etsy)