The leaning tower of slots

This was my first experimental stacking cake....it seemed like it was going along nicely, had all of the supports in and then when I the icing went on.....I noticed it....the leaning slot machine!!!......thank goodness this was for my mom and dad's birthday ( they are born on the same day) - dad didn't really care - it was cake to him and he thought it looked nice.....mom she understoody completely how frustrated I was since she had done cakes for years - she gave me a few tips and next time maybe success!