Answer:
In a result combination of your model, load cases that act alternatively ("or") are connected in such a way that they act positively once and negatively once. Negative factors in an RC can be problematic if the calculation is nonlinear: The failure of springs, tension members, and so on, then acts in the "wrong" direction and provides the corresponding results.
The RC results are combined from the existing results: if a support has compressive forces in a load case, the minus sign in the combination criterion converts the value and applies it as a tensile force.
Remedy : Define the load cases that should act negatively in the combination criterion as new load cases with a negative load.
