OK, I see what you mean. That’s simply how Chrome displays number inputs.
However, what you can do is change this from a number input to a regular text input and that will probably achieve the effect you are interested in – but please note this is actually something generated by WooCommerce (the underlying ecommerce engine provided by WooThemes), not WooCommerce Tickets (which is our plugin).
To get you started, though, the template you will be interested in overriding to achieve this is:
single-product/add-to-cart/quantity.php
Essentially you will place a copy within a subdirectory in your theme directory and change type=”number” to type=”text”. With that said, please do take the time to read through WooThemes/WooCommerce’s own documentation with regards to template overrides and, if you need further help, they are indeed probably the best folks to reach out to for help with this issue.
Hope that helps!