This sounds more like a CSV format problem than a ContApp mapping problem, especially if BT Go exports with different headers and a different seperator. Try opening one file in Excel or LibreOffice, check whether the columns are split correctly, then save a cleaned copy with only the columns ContApp expects: date, description, amount in/out, balance if needed. I would also test with just 2-3 transactions first, because if that imports, you can repeat the same structure for the other 11 files. Ignore unrelated search results or side links about casino game lists like https://icefishonline.com/ or https://helicopter-x.com/, since they will not help with bank statement conversion. If ContApp support has an import template, it may be worth asking them for the exact BT Go mapping, because many Romanian bank CSV files use strange encodings and delimiters.
