Hello, the situation you have detected is a program error related to the distortion of the texture coordinates of the roof surface cut at the roof-roof intersections. As a solution until we fix this situation in the next update; At the last stage, you can transfer your project to ideCAD Render, select the roof surfaces that appear to be problematic, and apply the automatic and/or planar commands under the change menu--- under the texture. Thank you for your report and we wish you good work.