Hi there @Blispy !
Don here from Shopify.
If you have added apps like this to your store and notice some issues like this after removing them, it is quite likely that these apps added some code to your store’s theme that would need to be removed.
You can try reverting any changes made to the code of .liquid files by these apps in the Online store > Themes > Actions > Edit code menu.
Near the top of any file you have edited there you will see a drop-down titled ‘Older versions’ that you can click on to roll back any changes made to that file as shown:
You can also get support with this by contacting the developers of the third-party apps in question, who will be able to help out with finding and removing this code for you.
I had a look for the Active Cart app you mentioned as well as the Bold Sales Motivator one if you want to reach out to their developers for support, you can use the contact details listed there on the app store pages.
This should help you to remove any leftover code and resolve the issue you mentioned here.
Are you still getting set up with your Shopify store or have you been selling already?
Regards,
Don