It appears that the index value of the indicated for loop changes inside the loop body. Often, this happens when loops nest and an inner loop reuses the name of an outer loop index. Because MATLAB resets the loop index to the next value when it returns to the top of the outer loop, it ignores any changes that took place within a nested loop. If the code does not to refer to the outer loop index value after the inner loop changes it, no problem results. However if you attempt to use the outer loop index value after the inner loop completes, it is likely to result in a bug.

Change the name of one of the for loop indexes. If you must keep them as is, add a comment documenting the need and suppress the message as described in Adjust Code Analyzer Message Indicators and Messages.