On plugin activation (cleared option from DB table to make sure we started fresh):

    a:12:{s:17:"img_base64_enable";s:1:"1";s:25:"moulding_combination_page";s:0:"";s:24:"moulding_collection_page";s:0:"";s:25:"idea_gallery_thumb_height";s:3:"200";s:24:"idea_gallery_thumb_width";s:3:"200";s:23:"collection_thumb_height";s:3:"200";s:22:"collection_thumb_width";s:3:"200";s:20:"profile_item_columns";s:1:"4";s:17:"idea_item_columns";s:1:"2";s:24:"collections_item_columns";s:1:"2";s:25:"combinations_item_columns";s:1:"4";s:21:"profile_element_order";a:5:{i:0;s:8:"Option 1";i:1;s:8:"Option 2";i:2;s:8:"Option 3";i:3;s:8:"Option 4";i:4;s:8:"Option 5";}}

After re-order with ajax (it looks like it's being duplicated here but on refresh, no errors):

    a:17:{s:17:"img_base64_enable";s:1:"1";s:25:"moulding_combination_page";s:0:"";s:24:"moulding_collection_page";s:0:"";s:25:"idea_gallery_thumb_height";s:3:"200";s:24:"idea_gallery_thumb_width";s:3:"200";s:23:"collection_thumb_height";s:3:"200";s:22:"collection_thumb_width";s:3:"200";s:20:"profile_item_columns";s:1:"4";s:17:"idea_item_columns";s:1:"2";s:24:"collections_item_columns";s:1:"2";s:25:"combinations_item_columns";s:1:"4";s:21:"profile_element_order";a:5:{i:4;s:8:"Option 5";i:0;s:8:"Option 1";i:1;s:8:"Option 2";i:2;s:8:"Option 3";i:3;s:8:"Option 4";}i:0;s:8:"Option 5";i:1;s:8:"Option 1";i:2;s:8:"Option 2";i:3;s:8:"Option 3";i:4;s:8:"Option 4";}


On plugin page-save (profile_element_order is gone):

    a:11:{s:17:"img_base64_enable";s:1:"1";s:25:"moulding_combination_page";s:0:"";s:24:"moulding_collection_page";s:0:"";s:20:"profile_item_columns";s:1:"4";s:17:"idea_item_columns";s:1:"2";s:24:"collections_item_columns";s:1:"2";s:25:"combinations_item_columns";s:1:"4";s:25:"idea_gallery_thumb_height";s:3:"200";s:24:"idea_gallery_thumb_width";s:3:"200";s:23:"collection_thumb_height";s:3:"200";s:22:"collection_thumb_width";s:3:"200";}