High memory usage with QCMaquis

I'm running a DMRGSCF(25,21) calculation with 5 CI roots and minimal basis and the memory usage for the dmrg optimisation steps (as logged in dmrg.out) seems unusually high (around 110GB for the latest iteration) - is this normal? I attached the OpenMolcas input file I use (exampleV.in) and the dmrg.out file.