potential bug in the Simplex method of optimtool box

Hi, when I use the linprog function with Simplex method, I found there are some inconsistent codes in the Simplexpiesewise.m and Simplexphasetwo.m files. In the simplexpiesewise.m file, the entering candidate variables are determined with the following constraints:

 % Choose the entering variable and check the optimality condition
    dualf = c_N - (y * N)';
 % k is the chosen (the first one that satisfies the conditions) index of the entering variable
kcands = find( ( (dualf >= tol) & (tol2 < ub_N - x_N) ) | ( (dualf <= -tol) & (x_N - lb_N > tol2) ) );

However, in the simplexphasetwo.m file, the constraints turn to be:

dualf = c_N - (y * Nonbasis)';
enterCandidates = ((dualf >= tol) & (x_N - lb_N > tol2)) | ((dualf <= -tol) & (tol2 < ub_N - x_N));

The two search conditions are different, could you please tell me why? Thanks!