'C After filling buffers with data, strange data appear

Buy debugging through SWD on STM32F746NG and putting break point in last line of the code below:

uint16_t data[128];
q15_t ref[64];
q15_t in[64];
.
.
.
for(uint16_t ii=0;ii!=63;ii++)
  {
    ref[ii]=data[ii*2+1];
    in[ii]=data[ii*2+1];
  }


  // 3.LMS processing
    arm_lms_q15(
            &myLMS,
            in,
            ref,
            dummyOut,
            error,
            nsamples
            );

  // 4.Visualizing errors
for(uint16_t bytecount=0;bytecount!=64;bytecount++)

Obviously all elemnt of ref and in must be the same but the last elemnt of these are not the same. the last element of data is 2617 bu is -15581 on ref and 2409 on in. The question is how to remove this data corruption in last element?

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'C After filling buffers with data, strange data appear

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