Hi John.
This patches could be due to what we call stretching the paint out.
What this means if you keep rolling, the paints starts to run out of the roller and the wall paper will start to absorb the paint, then when you go over the area again the roller will start to stick in the tacky paint leaving a slightly textured finish.
If you apply another coat, load your roller right up with paint, but not so much that it's dripping, as you said you have a medium pile sleeve, this should cover about 1.5 -2 meters square, cover the area very quicky at first then go back over straight away, but no more will be needed, go over this area as normal making sure the whole area stays wet.
I hope this helps you out
Joe Dybowski
www.simplybuildbetter.co.uk
Joe Dybowski
March 2011