iPhone alarm dismisses unexpectedly

Why does my alarm turn off when i haven’t pressed any buttons or slid the slider? When the slider feature was added I thought it was great, because sometimes I would accidentally hit the off button instead of snooze. I figured having to slide it would prevent accidents like this. But now it will turn off if i tap the bottom of the screen. Don’t even have to press the slider button, let alone actually slide it. So what’s the point?