I have a problem with adding/removing products from the cart. The funniest thing is this that problem occurring randomly. It happens that a product that doesn’t want to add is added after 2-3 clicks in "add to cart".

What I have done so far:

• Created local instance (with same files and databse)
• Enabled default theme
• Disbale all plugins except WooCommerce

… and problem still exist. What can I do more? Is it possible to diagnose if it’s not a database problem?