Help with key on macbook pro!

i removed period (.) key clean it. when put on tested see if came off , extremely easy take off. i've noticed bottom left corner easy take off. maybe wrong hinge? also, tested other keys , more difficult lift off. please help! thanks.

 

there 2 clips on key caps. 1 intended snap onto scissors, other intended slide diagonally onto one.

slide 1 of scissors receiving flange under keycap, press key down , clip snap onto other scissor.

 

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