I have created an event that can be bought 150 tickets and sold 10, however in the “counter” displayed on the event page (which customers see) is still ticking remaining 150 tickets available, rather than 140 tickets available.
I see you’re using Event Tickets Plus + WooCommerce.
When someone adds any quantity of tickets to their cart and checkout, do you see them in your wp-admin > WooCommerce Orders as needing to be completed?
And once you “complete” the Order, does the stock quantity then reflect an accurate count?