Data Displaying in incorrect text boxes on SSRS

I have an SSRS report which I created using Visual Studio 2015. Yesterday the report was working perfectly. Today I added a couple of columns to the query (it uses a stored procedure), and changed the name of a column I don't currently use in the report. When I ran the report again suddenly the data is appearing in the wrong text boxes. I have run the query both in SSMS and SSRS numerous times to ensure the correct data is being returned in the correct columns. I have also checked the XML code on the report to ensure the correct fields are being referred to in the correct text boxes. I have never encountered such an error before. Please help!