Adding to Numbered List using Create

Hi, 

I (full access user) have created a process where my data list is updated in the following way:

1) I created a numbered list (purely for the "create" function), and published a module referencing this list to a dashboard along with the create button. 

2) Users can then create new line items, fill in data, and run a second process which loads the data to the actual data list

3) the process is working perfectly in my QA model, but when I push to UAT, the process doesn't work. The message I get is "Sorry, you do not have permission to perform this action on the item(s) selected"

4) I don't think it's a role-related issue, as I am a full access workspace admin in both environments, there is no DCA involved, relevant lists have been made production lists, and it's not a synchronization issue. 

I can fix the issue by creating a permanent line item in the numbered "additions list" (ie: a line item that does not get deleted once the data is loaded), but I do not like how this looks, and I still do not know the root of this issue.

Any ideas? 

Thanks,

Andras