I checked your site and it is opening like this following image:

Link to image: https://d.pr/i/FnMgUq
Do you mean you are trying to fix the above display? It definitely looks like there is some problem loading the scripts. This kind of problem is usually caused by either a conflict with your theme or with another plugin.
?
The best way to determine this is to:
- Temporarily switch your theme to Storefront
- Disable all plugins except for WooCommerce
- Repeat the action that is causing the problem
If you’re not seeing the same problem after completing the conflict test, then you know the problem was with the plugins and/or theme you deactivated. To figure out which plugin is causing the problem, reactivate your other plugins one by one, testing after each, until you find the one causing conflict. You can find a more detailed explanation on how to do a conflict test here.