ajax add to cart fail when wpml is enabled

My site ran this plugin without WPML for a long time and never had any issues with its ajax add to cart feature, but ever since I activated WPML a issue started to show up, it’s when you immediately switch to cart page (leaving the product page) after clicking the ajax add to cart button, finding that the added product doesn’t show up in the cart page. It’s not easily reproducible but occurs from time to time. Is there any incompatibility issue between this plugin (4.0.4) and WPML?