That version was the one that introduced the bug so you would need to update to a later version as this issue was fixed in 2.9.6.
Note the current version in debian (2.9.9) has an issue affecting tool offset parameters:
forum.linuxcnc.org/38-general-linuxcnc-q...38-2-weird-behaviour
So you could get the appropriate deb package for version 2.9.8 from here:
github.com/LinuxCNC/linuxcnc/releases
Or wait for version 2.9.10 to be available in the debian repositories to be able to update through the update manager.
