Hi @khanshabnam! Thanks for sharing more details and screenshots with us!
I have tried to reproduce it on my end but it’s working as expected.
I can see that you’re using some plugins integrated into your checkout page, like the WooCommerce multistep checkout.
This kind of problem is usually caused by 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 of how to do a conflict test here.
Let us know how it goes!
My very best,