Looking at your Virtuoso version it is an old Virtuoso 07.20.3217 version from 2017 and would recommend updating to the latest stable/7 release to see if this solves the problem.
Looking at your Virtuoso version it is an old Virtuoso 07.20.3217 version from 2017 and would recommend updating to the latest stable/7 release to see if this solves the problem.