My xpro is mesisng up constantly,every roll out of my last 5 hasn't come out clear.

Www.flickr.com/wilfbiffherb

Follow the above link and look at the first 2 pics,you'll see the last shot on the roll seems to be touching the film beneath it on the spiral and the film deepest into the spiral is really dense. The rest of the roll is very unevenly developed. Does anyone know why this could be happening?I'm using a jobo cpe2 with plastic spools and rollei digibase chems with a variety of 120 films. Any help would be super appreciated!!