Hi,
We have tested Wisteria Lite and the Mobile Menu is working as expected. You may have a look at the following demo link.
https://wp-themes.com/wisteria/
Possible Issue:
There must be JS error due to any plugin or custom coding. Please check the browser console and make sure that there should not be any JS error. If there is JS error, please deactivate the buggy plugin or correct the related code.
Thanks