CX-5 2017 Liftgate doesn't close completely

My power liftgate doesn't closed completely.' It's almost closed but doesn't have enough power to locked. It produce double beep and stop. If I push it will close. To avoid problem I shoud hardly push sealing rubber before every closing. What causing problem liftgate strut or lock? I dont have any problem when I open liftgate.
. Thank you.
 
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