I have seen similar posts, but no real answers.
In both desktop and mobile mode, I cannot turn the quantity selector to 0 when in cart. I also cannot delete the item from cart. Would be good to be able to do both.
I have read that this is possibly due to installing an app in my theme. None of my apps are unusual apps so I would be surprised if this is the answer.
Any help greatly appreciated.
For the below ensure that NO apps automatically insert codes into unpublished themes, responsible themes make you configure themes they will affect explicitly.
Duplicate old theme and reproduce the problem steps in the duplicate.
If not working then most likely old theme has a broken customization, or misbehaving app,etc
Since still not working in the duplicate theme, go into the duplicate themes theme.liquid file and find {{ content_for_header }} code and delete that line then test again.
If duplicate theme cart works without {{ content_for_header }} then it is most likely an app interfering.
If still not working
Either install a new copy of the current theme , or install any new free theme and reproduce the problem steps in this new presumably untouched theme.
Ensuring that NO apps automatically insert codes into unpublished themes, responsible themes make you configure themes they will affect explicitly.
If new theme works then most likely old theme has a broken customization, or misbehaving app that doesn’t use content_for_header,etc
If still not working in a new theme, go into the new themes theme.liquid and find {{ content_for_header }} and delete that line and test again.
If cart is now working then it is most likely an app interfering in all situations.