In one of my major interests I have no ranking. Why?

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This isn't a huge thing for me but it strikes me a bit odd. I have posted quite a lot in specifically NBA and basketball. In NBA I rank 19th and in basketball I don't have any ranking at all. Is this a glitch or have I done something to cause this. This is not a complaint. I am getting credit for all the posts being made. I just find it odd that I have no ranking at all.