Question edited for clarity.
My guess is that your drain hose is too high. The pump is in the base of the washer and pushes the water up the tube and into the drain/ when the pump stops, the residual water in the hose drops back into the base of the machine, so the higher the hose, the greater the column of water.
https://www.manualslib.com/manual/837407/Haier-Hlp21n.html?page=10#manual
Or
The Drain Pump is blocked or failing.
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