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Custom list button not opening window fully in production

I've created a custom list button in my sandbox, and it's working perfectly well.  However when I deployed it to production, it just doesn't open the pop up window fully, any idea(s) why this is occurring?

I've checked that the field references etc. are all correct, any help would be much appreciated.

Thank you in advance 🙏 

error window not opening fully
Sai PraveenSai Praveen (Salesforce Developers) 

Did you check if the user has access to the fields and related object is given access for the user.

Yes I did.