linux - Strange Behaviour of [SED] when put in shell script -

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when doing 

sed 1s/#text_to_be_replaced#/replacement_string/ filename

then output expected when put in shell file , 

linenumber=1 sed $linenumbers/#text_to_be_replaced#/replacement_string/ filename

then doesn't work expected replacement_string gets inserted 1 line above text_to_be_replaced. why happening ?

it should be:

sed "${linenumber}s/text_to_be_replaced/replacement_string/" filename

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