This path is larger than Liberate's automatic arc, but it is not measured and result absent in measure.rpt and measure.rpt.fastsim file. Consequence Liberate is take value from Liberate's automatic arc.
Leakage current from characterization to larger than simulation.
My suggestion is to do the reverse-engineering flow, where you load an existing .lib file and use arcs from it. Silicon smart supports that, I assume Liberate does it as well.