Try meta_value_num
'meta_key' => 'metadata1',
'orderby' => 'meta_value_num'
Add these 2 parameters to $args. This does the sorting considering metadata1 as numeric
Try meta_value_num
'meta_key' => 'metadata1',
'orderby' => 'meta_value_num'
Add these 2 parameters to $args. This does the sorting considering metadata1 as numeric