Unfortunately this is an issue with the notifications implementation on iOS 10 and higher (Note this is not an issue on older iOS or Android).
The newer "UNNotification" framework introduced on iOS 10 only allows for a single trigger per notification, i.e. either a time in the future or a recurring interval, which conflicted with the methods that we had implemented in the past. So if you set a recurring notification it recurs at the time you call notify.
There are some additional recurring triggers though that we haven't implemented as they haven't been requested as yet, that probably would match your requirements. We can use a "calendar trigger" which triggers at a certain hour/minute each day.
Just make a request on github and we'll get it added into the extension.