Order Email subtotal calculating addon items incorrectly

-- HikaShop version -- : 6.1.0
-- Joomla version -- : 5.3.3
-- PHP version -- : 8.3

Situation: an item with a price of $15, with an addon item priced at $1. When the customer adds 10 items, with 10 addons, the receipt in the email is adding all 10 $1 addon items to each product, making the subtotal calculate each item at $25.
The final total is accurate: $160 ($150 + $10) but the subtotal shows $15 + $10 x 10 items = $250.
This is only occurring in emails, the cart display is correct during checkout.
Edit: I tried turning off Group Options With Product, but it didn't change the subtotal in email previews.

Hi,

I've never seen this issue and I'm not able to reproduce it.
Could you provide a backend access and a FTP access in order to look into the issue via our contact form ?
www.hikashop.com/support/contact-us.html