There are three common causes of streak marks when painting with a paint roller.
Streaking can occur if your roller was not sufficiently cleaned and left loaded overnight with paint. Next time you use it, the paint will still be on the roller and cause streaking.
Improper loading of paint on the roller can also cause streak marks. Too much paint has been loaded on the sides of the roller creating a fencing streak and a shallow centre.
Another possible cause is paint between the roller and the steel axle. This causes the roller to get stuck as you roll it and causes intermittent streaks on your paint surface. - EricL