I'm constantly having a problem when using "Extract by Mask". The output of this tool is coming with an "extra" area that is not in my original shapefile. I've attached three figures showing my raster file (NLCD 2011), a shapefile with some counties from Georgia, and the output when I tried to extract the raster file using the shapefile. As you can see, especially on the northeast part of the figure, there are "extra" areas in my output. I also had this same problem with different other files in completely different locations.
This error is similar to the black border error of projected satellite images and DEM, but in my case, these extra areas have real data, they are not just a black square, but part of the original data.
All my files are on the same coordinate system (WGS_1984_UTM_Zone_17N)
Is there any solution?