[Python] Floating animation slowly moves object upwards Pygame

I'm writing a script for an object that's supposed to hover in place, but instead, it slowly moves upwards. Heres the code:

(Init function)

self.vy = 0
self.dy = 0.1


(Update function)

self.vy += self.dy
if self.vy > 1 or self.vy < -1:
self.dy *= -1
self.imgRect.centery += self.vy

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