Thank you for the answer.
I fixed this issue by Opening a file using record length (RECL) specifier:
Open(1,file='test.txt',RECL=1024)
write(1,*) 'aaaaaaaaa ','aaaaaaaaa ','aaaaaaaaa ', 'aaaaaaaaa ',&
& 'aaaaaaaaa ', 'aaaaaaaaa ', 'aaaaaaaaa ', 'aaaaaaaaa ',&
& 'aaaaaaaaa'...