So much for my self imposed hiatus from klov, and sadly for the very reason I opted to take a break.
Long story short, this is clearly a paint prep problem. From the looks of it, there are two colors of brown with one separating from the other. My quick visual guess is that the second brown color is the original joust brown which would indicate there is no primer or prep done. I could be wrong, but that's how it looks to me. Either way, one layer of paint separating from another is a sign of things not being right at the paint level. Also, stencil material is not standard print vinyl, it's designed to tear. When removing large or complex stencils it's quite normal to pull an area and tear it off and then pull another and tear that off.
I received an email moments ago with me on full blast. I promise you Eric, the problem here is not with the stencils and had you simply asked for a hand or advice or replacement parts for free i'd have happily obliged as i've done dozens of times over the years. Not everyone gets it right the first time and I try to help people get there. However, posts like this and the tone of the email you sent me are not likely to get a smile and offer of help from me.
Sometimes just be willing to admit you perhaps made a mistake and need a hand. It will always work better than blaming others and writing nasty things.
/brian