It sounds like Typo II is getting LISTed to disk along with the actual program.
From https://www.atarimagazines.com/v3n9/TYPOII.html
"To remove TYPO II from your program: Type LIST "D:FILENAME",0,31999 (Cassette owners LIST "C:",0,31999). Type NEW, then ENTER "D:FILENAME" (ENTER "C:" for cassettes). Your program is now in memory without TYPO II and can be SAVED or LISTed to disk or cassette."