That kept happening to me, only it evolved into this weird character as an adult. I got so upset, that I never played with it again. It happened around 4 times in a row! <_<
that's probably because you are getting lots of funny points.
if you are playing apple alot, try playing shapes or manhole.
or, if you are playing tug of war or climb alot, try shapes or manhole.
climb and tug of war will give you random skill points, apple will give you funny, shapes will give you gorgeous, and manhole will give you spiritual.
in other words, don't get lots of funny skill points.(or if you want to keep getting ura mametchi, then get funny skill. you won't get him as a girl. if you do, then that's just scary. )