Calendar problems are the fastest way to lose a client's trust because the failure is visible to their customers. A double booking is not a bug report, it is an apology call. Five failure modes cover almost every calendar issue we see, and each has a specific fix.
Double bookings and ghost availability
Double bookings almost always trace to two calendars writing into one Google or Outlook account with conflict checking pointed at the wrong one. Ghost availability - slots that show but should not - is usually a disconnected sync that failed silently weeks ago.
The fix for both starts the same way: open the connected accounts page and verify every connection is green and pointed where you think it is. Half the time, it is not.
Timezone drift and buffer misfires
A calendar set to account timezone while the team member sits in another region produces bookings that look right to the customer and wrong to the person taking the call. Set timezones explicitly per calendar and per user, never by inheritance.
Buffers and minimum notice interact: a 30-minute buffer with 4-hour minimum notice can silently block whole mornings. If availability looks thinner than it should, calculate what your rules actually permit.
Event loops from bidirectional sync
Two-way sync plus an automation that creates events from bookings can loop: the created event syncs back, looks like a new booking, fires the automation again. If you see stuttered duplicates minutes apart, this is why.
Break the loop by making one direction authoritative and filtering synced events out of the automation trigger.
Key takeaways
- Check connection health first - silent disconnects cause most ghosts
- Set timezones explicitly per calendar and user, never inherit
- One sync direction must be authoritative or automations will loop
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