transition transversion ratio (ti:tv)

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siti
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transition transversion ratio (ti:tv)

 hi all, i'm doing a project on phylogenetic and i'm using PAUP for my analysis. my problem is, my transition/transversion ratio is a bit different. usually, people will get transition value higher than transversion. but mine, i got higher transversion ratio. i'm using HKY model. can somebody explain to me how did this situation happen?

tq.