Calendar sync all events not working
I am operating the latest IOS and OSX on Mac, iPhone X and iPad. I have a Subscription to a calendar that has events throughout the year. I have issues in that the 3 devices are only syncing the last few weeks.
I have followed forum advice and removed the subject calendar from all devices.
I have then followed advice and resubscribed to the calendar from the MAC OSX system, the calendar shows up in the other 2 devices but the last few weeks are all that i can see. I have checked the settings within the IOS devices and both have Sync All Events set. However there is no similare settign within the MAC OSX setting, well i cannot find it.
Anyone suggestions on how i can sync all the events on all 3 devices please?
thanks
JohnW
Mac mini (Late 2014), macOS Sierra (10.12.6)