I am using Fossify calendar to sync two calendars through DAVx5 with equal settings. The sync works, i.e., I can create new appointments that will show on my other device. However, while all appointments of the first calendar are displayed correctly in the app, those of the second calendar are not. Only some daily events are displayed, whereas all appointments by the hour and most daily events are not shown. Even when I create a new appointment in the app for this second calendar, it disapears imediatly although being synchronized correctly. Any ideas?
(For both calendars, the server is a personal NAS (Synology), my phone is a Pixel 7a, and the divice I am synchronizing with is my note book (Thunderbird).)