Hi – sorry you’re facing difficulties here.
I don’t believe this is a bug and I certainly can’t replicate it locally: is it possible that you – or someone else working on your site – inadvertently changed the price to zero and/or there was still stock remaining?
Or, could it be the ticket products themselves were edited in WooCommerce’s product editor and stock control was turned off (perhaps accidentally)?
Last but not least, can you reliably replicate this yourself and if so can you provide a step-by-step breakdown to help me replicate the issue?
Let me know!