Hi there,
Taking a look at your page, I believe you are referring to the “Seach by Manufacturer / Model / Location” filter at the top (please let me know if you meant something different on the page). (Also, small typo in your label there “Seach”)
Checking out those dropdowns, they appear to be working as expected when I try using them. I can select the dropdown, scroll through and select different options:

Link to image: woocommerce_template_loop_stock
Are you seeing something different? Please explain a bit more about the issue you are seeing. Screenshots could be helpful too. I recommend https://snipboard.io for easily sharing screenshots – you can follow the instructions on the page, then paste the URL in your reply here.
Also, please share a copy of your site’s System Status. You can find it via WooCommerce > Status. Select “Get system report” and then “Copy for support”. Once you’ve done that, you can paste it here in your reply.
Hi there!
I see the screenshot we included in our last reply did not format correctly, so I have attached anew recording of what we see;

Link to image: https://d.pr/i/twIvXJ
If that is not what you are seeing, could you follow the steps in our last reply please?
Hi @rcbunker,
We’ve not heard back from you in a while, so I’m marking this thread as resolved. Hopefully, you were able to find a solution to your problem!
If you have further questions, please feel free to open a new topic.
Thanks.