I stored everything in multidimensional arrays and when adding new sets or new rows with keys that already exist in the sequence hindered the correct reordering of them.  Example:

The grid is comprised of

$set1[$key1][1]= $array1;

$set2[$key2][1] = $array2;

with $key1 and $key2 being numerical.

Adding a new row of $set1[$key1] at the end of the grid, i.e.,

$set1[$Key1][2] needed to generate the following order:

$set1[$key1][1]= $array1;

$set2[$key2][1] = $array2;

$set1[$Key1][2] = $array1;

However, no matter what I did to populate the arrays sequentially, the order reverted to:

$set1[$key1][1]= $array1;

$set1[$Key1][2] = $array1;

$set2[$key2][1] = $array2;

The easiest fix I could find (I know several others are out there) to achieve the goal was change the keys from numerical to strings.  I did that by combining them and separating them by a glue character (-, @, _, etc.).  The result was:

$set1[$key1_1]= $array1;

$set2[$key2_1] = $array2;

$set1[$Key1_2] = $array1;

To process the data afterward, I split the keys into an array by taking into the account the glue character that I used.