One slow motherfucking jar!!!

http://imgur.com/a/vXkps This little bastard has been growing at an alarmingly slow rate. This jar is probably a month and a half old now.On the right side you can see its colonized a large amount of the WBS but on the left it has hardly moved since the 2nd week while the right continues to grow. I had another jar exactly the same except it was a different strain. The 2nd jar colonized just fine and is fruiting right now. What the fuck is the deal??? Also I have a spawn bag thats kinda doing the same thing. The bag colonized everything except a small section of a corner.