Slots not always apearing when using staff members

[Valentina R]

We have been working with your plugin for a few month now and it all works very smoothly except for 1 strange thing. There are different locations for which I have created different users. The available slots are used for different consults (healing sessions). One consult is 20min. the other two are 40 min. On July 22nd there are still two slots available of 40 min (12:00-12:40 and 14:20-15:00) at location ‘Delight Yoga – Nieuwe Achtergracht 13 Amsterdam’ (staff=13), but they do not show up in the 40 min. products and it says that it is full booked that day. However if you check the 20 min. product the slots do show up as available (12:00-12:20, 12:20-12:40, 14:20-14:40 and 14:40-15:00).

20 min consult
https://www.junoburger.com/en/product/realease-me-follow-up-consultation/?date=2020-07-22&staff=13

40 min consult
https://www.junoburger.com/en/product/realease-me-introductory-consultation/?date=&staff=13

Screenshots here.

[Valentina R]

Update.

The only problem seems to be with a slot showing up as available and then upon selecting it, showing ‘not available’.

WPML and WC Multilingual are used. All plugins are up-to-date.

gCal sync in only used globally. The rule that is removing the slot is a normal Google Event:

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