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Hmmm - I missed to post the necessary IFS modification. Try again with this slightly modified version:
IFS=$'\n'

for IN in $(echo "${!ENTRIES
}" | tr ',' '\n' | sort -un)
do [ !...

shuf -e ${!ENTRIES[@]} | sort -t, -k1,1n -k2,2.2Vr |

--- Post updated at 14:02 ---

And so it works
sort -t, -k1,1n -k2,2.2r

Try paste:
echo "${!ENTRIES
}" | sort -t, -k1,1n -k2,2.2r -k2.3 | while read IX; do printf "%s\n" ${ENTRIES[$IX]}; done | paste -sd"\t\t\t\n"
111.122.133.20 unas15533 unas # UNAS...

Did you set the IFS variable as indicated?
Try the sort keys given with netzabudka's proposal as well.

shuf -e ${!ENTRIES[@]} | sort -V | while read d; do echo $d=${ENTRIES[$d]}; done

--- Post updated at 12:01 ---

can play with the options of the "sort" command :)