Very strange: the exported CSV should not be like that!
What is your AMC version? Can you send a minimal project directory showing the problem?

The version is:
Auto Multiple Choice 1.2.1 (svn:1403)
running under OpenSuse 13.2 or OpenSuse Leap 42.1

I attach a project in the test_bug.zip file.
Thanks,
Rafael

Thanks.
If you name two questions with IDs test.1 and test.2, AMC will join the score of question test.1 and the score of question test.2 to form a single string that will be affected to "test". This feature is used by AMCcode for example, to collect several digits of a student number.
I think this is not what you need here: you should not use the form "xxx.nn" for your question IDS (use t1:1 instead of t1.1 for example), and you will get something clearer.
I think there is no problem creating a new project with you same source file (changing only the question IDs) and using the same scans.

Thanks a lot. I missed the following paragraph in the documentation.
I apologize for the inconveniences.

Rafael

Important
One must use a different identifier for every question. An identifier can be made of digits, letters, and simple characters
(but do not use e.g. braces or brackets). Don’t end your question identifier with a dot followed by digits, as this syntax
is reserved to codes input.