I'm attempting to draw flex duct from a main branch to individual diffuses. When I do this I get a flex duct that ends up being three times the needed length. Revit is auto routing the duct to three 'passes,' one to the diffuser, then back to the branch, then back to connect to the diffuser again. I'm not sure why it is doing this and I'm not able to shorten the length of the flex. Any suggestions?