It may be the case that although your appointments are one hour long, they may appear as though they are perhaps 15 minute slots, looking very crammed together and have text missing as below:

Click "Settings" and then "Users", select your user account, and scroll down until you see "Calendar Settings" and edit your "Slot duration (minutes)" field:

The fewer minutes allocated the larger the view of the appointment in your calendar. This has been changed this to 15 minutes and now looks larger: