MATLAB bug(?)

test = imerode(inputImage, astrel); % slash
test = imerode(test, bstrel);       % backslash
test = imerode(test, cstrel);       % cross

tmp = strel([astrel bstrel cstrel]);
test2 = imerode(inputImage, tmp);

isequal(test, test2)  % this returns 0 for me and figure;imshow(test ~= test2) shows the border pixels differ.. which is consistent with the discrepancies I'm seeing :/