...and I finally have a solution that works. It seems that the problem persists, if you use Apple Numbers and export them to CSV. The easiest way to go around this is not to use Numbers. Instead I used Google Sheets and it worked beautifully.
Hi, I have the same problem and now understand that one needs to use a comma and not a semicolon. But where, exactly, do I use a comma? Since I haven't used any semicolons either...