Flipbooks display crookedly in 2d side-scroller on Unreal Engine. How to solve it?

Question

2D

Unreal Engine 4.
2d side-scroller.
2d sprites are drawn without a stroke.
On the engine are collected in flipbook'i.
They are inserted crookedly, then they hover above the ground, then they "drown" in it. It feels like they are set along the upper border of the png files from which the sprites were made.
Please suggest a solution to this problem.