One advantage of that arrangement is that you could lift one bike up, twist it to align with the normal orientation of the rack (you'd bend the top tube, but hey, you didn't park the bike like an ass) to make space. Then lock your bike up properly.

Seriously, slide the bike on the right to the left a bit, It will overlap the other bike, but shouldn't harm anything. Then lock your bike up on the right.

Or, by a half-dozen of cheap U locks off ebay and add them to the two bikes lock complement. They'd be very secure!