Runner goes back to previous base....

[eyezen]

Posted on fan forum I lurk on. Obviously the poster is more worried about scoring issues which I know isn't really a umpiring issue, but what if anything should of really happened? Is this all legal? My gut feeling says no but defer to you guys.

POST:
How do you Score something like this??

I was umpiring a youth tournament this last weekend and had an interesting occurance. Situation is a runer at first, no count on the batter. Runner takes off for second, the batter swings and misses, catcher drops the ball then picks it up and fires it to second but not nearly in time. After the shortstop throws it back to the pitcher, the runner inexplicably trots back to first base. The team on defense doesnt notice it and he ends up at first base after stealing second. There was no foul ball called, no reason for him to go back. After a little confusion and a good laugh by his coach (they were up 7 or 8 runs) the kid steals second base again on the next pitch. My question is would he be credited for 2 stolen bases, even though he stole the same base twice???