Calendar shows NO AVAILABILITY even if the day isn't booked at all

Hi everyone! It’s been 10 months since I created my wix site. When I created it, I noticed a problem with the calendar availability in the live website, the next 30 days seem always to be blocked and it results: “This date is not available. Try another.” even if these days aren’t booked yet. Clients always think that our office is fully booked even if it is not. It is causing some serious problem lately. I thought this problem will get solved through time, thinking that maybe there was a bug that Wix was still trying to solve but it is almost a year and we still have this same problem ;(

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