I get , when is expected

I get , when is expected.
But I also get , when is expected -> see below:

# ./check_mtr -H 192.168.92.248 -c 5 -p 1 -P 2 -l 1 -L 2
OK
mtr –no-dns -i 2 -t 192.168.92.248 –report -c 5 –report-wide
HOST: HOS-BOA-MGMT01 Loss% Snt Last Avg Best Wrst StDev
1. 192.168.60.1 0.0% 5 0.6 0.6 0.6 0.6 0.0
2. 172.16.1.1 0.0% 5 0.5 0.4 0.4 0.5 0.0
3. 172.16.1.13 0.0% 5 0.6 0.6 0.6 0.8 0.1
4. 172.16.1.14 20.0% 5 1.2 1.1 1.1 1.2 0.1
5. ??? 100.0 5 0.0 0.0 0.0 0.0 0.0

In the above example, I would expect , but still get .

.. Any idea?