If this is a church league, you may be playing in some gyms with the older fan-shaped backboards. The rules for the ball going over the "top" of the backboard toward the wall (not hitting the top and coming back toward the rim) are different than for a rectangular backboard. With the rectangle, a ball that does what I described is OOB, but with a fan-shaped it is not. The theory is that you cannot distinguish what the "top" of a fan-shaped board really is, so the entire edging is considered the "side".
I'm sorry if you are even more confused now. I didn't mean to befuddle the issue.
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Yom HaShoah
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