Expected, not an issue. See:
Debian maintains the older version of Tor, and as Whonix is based on Kicksecure which is in turn based on Debian, we use Debian’s version of Tor.
EDIT: The above statement about us using Debian’s version of Tor was mistaken. My apologies. As documented at Tor integration in Whonix Development Notes, we are using Tor packages downloaded from deb.torproject.org, then migrating them to deb.kicksecure.com.