I have the HTC Desire, no problems with my Calendar. Never seen that problem before. Have you thought about trying one of the alternative calendars from the Android Market? That may be better for you, if the problem persists, till you sort it out.
OnePlus 5 review
Best of the Grad Shows 2017: UAL Central Saint Martins
MacBook Pro 15-inch (2017) review
Comment connecter un MacBook à une TV ?