Synchronization time limt not respected EMC v. 9.1.2053

After downloading the above lates version to solve the problem with the license activation, I fell into another problem. I have set the synchronization time 1. on startup and 2. every 15 minutes (see attached image). EMC does not respect the limit of 15 minutes and therefore but if I click the refresh button on the 16th minute new enails are downloaded. It’s a bug to be solved!!!.

OS Win 10 Pro.
All Accounts are under IMAP protocol.

This setting only applies to folders other than the Inbox, as well as calendars and contacts.

If the Inbox is not syncing in real-time, there may be some other issue.

I see you already have opened a ticket with us, so I will get more details from you that way.