Chargeback Percentage and the Shop App

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I would like to have the Shop app activated so that potential customers could find me there.

When I review the app it says that I don't meet the requirements because I my charge back

rate exceeds the 1% requirement.

I am the new owner of the shop, but in reviewing the charge back information it appears that 

only one charge back has occurred this year (the previous one in October of last year). The

store averages over 10 sales a month, so by my calculations (in my head) we should be less

than 1%. How do I overcome this and get the shop app activated?