for new listings you can comment this function, until the developers did not fix a bug:
// INSERT SALE AND QUANTITY WHEN LISTING IS PUBLISHED
function osp_item_post_data_insert( $item ) {
ModelOSP::newInstance()->updateItemData( $item['pk_i_id'], Params::getParam('osp_sell'), Params::getParam('osp_quantity') );
}
//osc_add_hook('posted_item', 'osp_item_post_data_insert');
//osc_add_hook('edited_item', 'osp_item_post_data_insert');