merge - R: left_join creating two extra rows -

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i'm working own dataset spatial data set. in spatial data set, 

    >nrow(bmorehoods@data)     > [1] 278

and data set has 78 rows.

after

    >a<-left_join(bmorehoods@data,mydata)     >nrow(a)     >[1] 280

then 

    >head(bmorehoods@data)

then row names appear 

    0     1     2     3      ...

and

head(mydata) row names appear 

    1     2     3     4     ...

so source of problem? or there other ways merge these data can use them?


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