MAS Updates tab showing apps that I have never bought or installed by any other means

i seeing updates apps have never used/installed/bought in updates tab of mas. if click on update, shows me dialog sign in different unknown apple id. have never used other apple id on mac. here screenshots:



in (possibly related) problem, why size of screenshots 1354 x 888, when size of macbook's display 1280 x 800?

 

are sure hasn't got access email address , password itunes, if have may downloading stuff on account?

screenshots, i'm guessing screen res 1280x800, mas window open @ 1354x888 when took screenshot.

 

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