Problem with Availability

Hi, I have been using this plugin for a few months on my website, and i like it, but for some days now I have been having a problem.

Availability is not correct, if I try to book a service, it tells me that there is no availability, but it is not correct, in those days I only have 2-3 reservations, and this happens for the whole week. I only work with this,
how can i solve?
thanks so much

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