- I installed web_responsive module on odoo 13 but it's not responsive
* I can't select an activity in mobile mode
* I can't add product on sale order line - I don't know what the problem is exactly
- can anyone help? (see screenshots attached)

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I can see, you already have posted the issue in OCA: https://github.com/OCA/web/issues/1736#issuecomment-729503946
I also tried it on mobile from the runbot and I did not find any issue.
Please try it on runbot.
yes it works on runbot but not on my odoo server!
Do you have any custom module/customization?