There’s no need for that. VirtualBox guest addition are installed default. And using the iso can cause some unrelated issues.
( VirtualBox Guest Additions )
Your /etc/tor/torrc looks wrong. This is how original torrc as shipped by Whonix looks:
Just a single line %include /etc/torrc.d/ plus comments
Did you add %include /etc/torrc.d/95_whonix.conf to /etc/tor/torrc?
That should be removed. To open that file in an editor:
lxsudo mousepad /etc/tor/torrc
Looks like you’ve updated from developers repository since only that contains the improved anon-verify. It shows:
4 files are used as Tor configuration files: \
/usr/share/tor/tor-service-defaults-torrc /etc/tor/torrc /etc/torrc.d/95_whonix.conf /etc/torrc.d/95_whonix.conf\
Meaning `/etc/torrc.d/95_whonix.conf` is parsed twice which results in parsing that file twice which configures the hidden service. That's the root cause.
At this point in time developers repository might be OK but I discourage to keep using it. To switch to another repository, see: