Why does the order of options change when the page is refreshed?

Question

MODX

{$_modx->runSnippet("msProductOptions", [
'onlyOptions' => $parent | resource : 'options',
'product' => $id,
'tpl' => 'tpl.msProductOptions3'
])}
<-- snippet
{foreach $options as $option}
{$option.caption}:
{if $option.value is array}
{$option.value | join : ", "}
{if $option.measure_unit}
{$option.measure_unit}
{/if}
{else}
{$option.value}
{if $option.measure_unit}
{$option.measure_unit}
{/if}
{ /if}
{/foreach}
<-- chunk
Every time the page is refreshed, the order in which options are displayed changes.

Answer 1

Look not there. Show where and how the $options array is formed.