Hi Benjamin,
Thanks for getting in touch!
Sorry to hear about this issue. Let me try to help you get this fixed.
As a first, if you have any caching plugin / minification going on, please disable that and re-check.
It definitely would also make sense to run a conflict test. Might be something is interfering here.
When I checked your page I saw 2 errors in the console on pageload. (screenshot)
It’s referring to these 2 files:
https://www.googletagmanager.com/gtag/js?id=UA-108438803-1
https://nevadasbdc.org/wp-content/plugins/woocommerce-products-filter/js/chosen/chosen.jquery.min.js?ver=4.9.1
So, might be worth deactivating these 2 to check if that helps.
Let me know if that changes something.
Cheers,
Andras