The most likely cause is the way you rolled the paint and you have either no texture on your walls (smooth) or very little. When a paint, especially a quick drying acrylic, is rolled the roller nap leaves a slight stipple. This stipple has a different pattern when rolled up verses down. This difference can show up with a sheened paint like Benjamin Moore Pearl.
When painting smooth walls it is best to "back roll" in a downward direction. Example – Apply your paint in the typical manner, up and down, then drop back and re-roll the section (without rewetting the roller) in a down only pattern. This usually takes care of a roller marks. Applying paint in this manner works best when the paint is applied thickly and not allowed to dry too much before re-rolling.
Also, if the paint is drying too fast add either Floetrol paint conditioner or a splash of water. This also helps reduce roller marks.