Sync with Google Agenda

Hello,
I’ve been using the plugin for several months now, and I’d synchronised it with Google Calendar.
Everything worked perfectly, but for several weeks now some of the bookings I’ve made don’t appear on Google Calendar.
I’ve tried resynchronising via ‘Synchronise bookings’, but again a number of bookings aren’t being taken into account.
They’ve been paid for, though, and I can see them appearing in the calendar.
Thank you in advance for your help, and I hope you have an excellent day,
Théo