Why is it only curly at the ends?

Any idea why my hair is so curly at the ends compared to how straight it is closer to the roots?

Washed and conditioned with Pantene Pro-V Miracle Bond Repair with Keratin and Vitamin E, detangled, scrunched with Tresemme Ultra Definition Gel, and air dried.

As far as I can tell my hair is low porosity and hasn’t been cut in 2.5 years.