Charged for more than I expected

Hello, I signed up for the Pro version on May 14 thinking the fee was $35 per month. I was instead charged for $50.72. My dashboard says I will be charged for $35 on June 14, so the $50.72 could not be a pro-rated amount for May and June.

Could someone please explain why I was charged for $50.72? Thank you.

The price is in USD.

Thank you.

Kind regards,
Karina Fuentes