I am modeling a pipe running across a series of pipe supports and restraints; most of the supports are simple +Y. Sometimes, the pipe lifts off under loading, and since these are +Y pipe supports, I would expect to see 0 as an Fy reaction force at that support. Instead, I see a positive (upthrust) force. Displacements report shows that the pipe is indeed lifted off the support. Any idea what is going on here? (I run Caesar 5.20)