Variation prices are wrong

Hello,
Variations price CAD(Works)/USD(Issue) don’t match anymore. The default price are set in CAD. products price CAD/USD alone are fine. The variation price on single product page are showing correctly but when you go on checkout page, this is where price are wrong. However, variations price price in USD are the only price wrong. I don’t know from where it gets it! I’m using a fixed rate with no fee. It used to work fine.

On the same product, 2 variations don’t even have the same rate.

https://revolutionsports.ca/product/standard-roller/
Price in CAD= Product 1495.00$ => USD 1279.42$ fine
Variation 1 CAD= 350$ => USD 300$ on checkout = 350.54$USD
Variation 2 CAD= 85$ => USD 75.00$ on checkout = 87.63USD
Rate: 0.8558

All variations price are wrong. This is my client website, so please I need to understand what is going on. I’m using WooCommerce TM Extra Product Options.

Thank you for your support.
Pierre