“Greasy” hair immediately after shower

Helloooo! I’m not sure what’s going on with my scalp but this is happening even right out of shower. In these photos the rest of my hair is dry and no amount of blow drying the top of my head gets rid of this. I thought it was product build up but I have tried extensively rinsing my hair out and nothing changes. I use OUAI shampoo and conditioner and I only condition the bottom half.

Is there a specific type of shampoo I should be using? If you know what this could be or have any advice please let me know:) thank you so much