Excel makes a .cvs file whose end-of-line (or newline) character is "\r".
But it needs to be "\n" for mjograph.
I will fix this problem in the next release.
As of now, it bothers you, but convert the end-of-line character.
Or you can use an earlier version that works fine.
(I have seen this problem only in the newest version (3.7.0) where I modified the data reading algorithm.)