Hmm, that is definitely strange. Do you have any sort of caching on your site? If so, I’d try emptying/resetting this cache and then trying again.
If that doesn’t do it, the problem might be due to a code conflict. I believe the next step in that case would be conflict testing, which means testing to see if the issue is being caused by a code conflict between plugins or your theme. The best way to determine this is to:
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1. Update all your plugins and your theme to their latest versions and see if the problem fixes itself.
2. Temporarily switch your theme to Storefront (https://www.woocommerce.com/storefront/).
3. Disable all plugins except for WooCommerce.
4. 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.
We recommend doing this on a staging site, if possible. WP Staging (https://www.ads-software.com/plugins/wp-staging/) is an easy way to create one if you don’t have one handy. You can find a more detailed explanation on how to do a conflict test here: https://docs.woocommerce.com/document/how-to-test-for-conflicts/.