Unlock screen inconsistency

The lock screen is so annoyingly inconsistent for me and I don't know if it's settings or a design flaw. I have fingerprint unlock set up. Sometimes when I press the unlock button or home button, I can put my finger on the home button and have it unlock the phone. Other times, I put my finger on the home button and it highlights the lock icon and I have to swipe it before anything happens. Other times, it just unlocks when I swipe the screen. I also don't understand how to go directly to a notifications app from the lock screen. Sometimes I click on it, have to swipe, and then fingerprint and it it's random as to weather or not it will actually open the app.

How do I need to set it so that when I wake the phone, I can consistently unlock it with my fingerprint?

Tnanks.