Recalculate all orders total in bulk

This cannot be calculated in bulk – we’ve never seen a need for this since core doesn’t break totals ??

You’d need to loop over the orders via PHP or API calls and call the total calculation function. This requires some custom code – I don’t have this to hand.

What plugin was it which broke this?

sorry for the very late reply
https://codecanyon.net/item/woocommerce-deposits-partial-payments-plugin/9249233

this is the plugin that made the mess, and i’ve tried contacting the seller but he has no clue how to fix this issue.

can you help me in writing a loop that goes on all orders and recalculate the totals, that would be great.

Use get_posts to get the orders.

Use wc_get_order per post ID to get the order object.

And use https://github.com/woothemes/woocommerce/blob/master/includes/abstracts/abstract-wc-order.php#L858 to do the calculation.