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@loafheads
your photo is totally useless to demonstrate your problem ;) take the photo from the opposite side to show cog, lockring, hub threads.
the reason it slipped is because the lockring / cog were not on all the way.
the way you can make sure is put the cog on and then ride the bike up a hill, "hard start" to make sure the cog is all the way on the threads. then take the wheel off and tighten the lockring as much as you can. get a good tool with some leverage. like that shimano one from PX or the FGL. dont pedal backwards before you tighten the lockring.
or it could be that the cog is thinner then the threads and that the lockring will not press hard enough on it to lock it. what brand of cog/lock ring is it?
also if you ride around liverpool st put on a front brake. people jump in front of bikes. its like they dont see you.