Password reset – Invalid key error

Hi, when a customer tries to reset his WooCommerce password, the system sends the email with the reset link. But when he clicks the link to reset the password he is taken back to the website where it shows this error:
“This key is invalid or has already been used. Please reset your password again if needed.”
I read many forums on this issue and we are not use WP Frontend, the issue is not in the email address and “&amp”, see the url:
https://paintsuppliesdirect.ca/my-account/lost-password?show-reset-form=true&action
And we exclude my-account page from caching.
The theme we use is Complex by LionTHemes. HEre is the link to the website https://paintsuppliesdirect.ca

I appreciate any help, thank you.

Andrea