The problem is with the raw data, something isn’t formated correctly. When you bring it into Excel and then save it, that error is corrected by Excel.
Before you’ve used excel to “Fix” the record, inspect it with notepad (not wordpad)
You will find something different at the end of the third record or in the fourth record. I would suspect the the Cr and/or LF is/are missing between the third and fourth records.
Try backing out this return and adding it back using notepad and resave it. it should now work…keep replacing characters until it does.
Once you’ve found the error, you will need to change the program that is generating the file.