Notification time
I have seen that this was mentioned before as an issue, but that's closed, and I just received a notification at the wrong time. I installed the app two days ago, and I think this happened yesterday as well.
I believe Feeel uses Central European Summer Time, that's UTC+2, because I am in Portugal which is at UTC+1 and I was just notified at 7am instead of 8am as selected. I have all the standard settings. So probably the app does not refer to the "local" time that the phone displays. If this error disappears "magically" in October and reoccurs in spring, the solution might be to add a line in the code that includes these two critical dates, and a line that corrects the "app time" accordingly. An error might still occur annually, depending on where on the globe you are when the switch from summer to winter time occurs (in Europe).
Alternatively, since "my" local time adjusts "automatically", probably it's possible to tell Feeel to use the "system" time instead.
Phone is Samsung S5 Neo with LineageOS (Android 10), updated last week.