Problem with block "Local Maxima"

Hi. I have a 128 x 1 input in block 'Local maxima'. I want to take as an output, the 4 maximum values of an input. I set: Maximum number of local maxima: 4 and Neighborhood size: [1 1]. I expect to take an 2x4 matrix each has in the first row the values i want. However, this block outputs 2 matrices with size 2x4. Why it happends?

EDIT: I use the 'simout' to spectate the output of block 'Local maxima'.

Thanks in advance!