This can easily be corrected by viewing the record in the Edit form and backspacing where the spaces caused by the use of the Enter key occur.
We encountered this issue in the library when IT decided to publish the local history databases online using MySQL. Any records where the Enter key had been used were rejected and unlike DB/TextWorks which informs you when records are not imported the library online database didn't.
One way to check for the use of the Enter key in a group of records is to export a set of records, view the export file in Notepad and use the Find feature (under the Edit menu) to locate the > symbol which appears when the Enter key has been used.
Another way would be to make the alterations in the Notepad file and then import the file back into the database, making sure that the the changed records replaced the existing records.