'Gnome-terminal --tab variables don't work

I am trying to open a new terminal tab and have a for loop print the iterator.

gnome-terminal --tab -- /bin/bash -c "for (( num=1;num!=-1;num++ ));do echo $num; sleep 2;done"

After executing the above command for some reason it only prints out the number 3

However, if i run it the command without using gnome-terminal it works as expected. for (( num=1;num!=-1;num++ ));do echo $num; sleep 2;done

Anyone know why?

bash gnome-terminal

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