I have used the same CSV file for almost a year without any issues when I import it. The last time it imported correctly was on December the 5th. Since that time when I have imported my CSV file it ignores commas beginning on the second row; it will actually include the commas in the first column.
Here is a link to some screenshots I took to show you - you will have to move through all 4 images. https://i.stack.imgur.com/UE3PC.png
Image 1: shows the CSV file when opened with Excel
Image 2: shows the CSV file when opened in Notepad
Image 3: shows what the table looks like after I import it. You can see beginning with store7 it contains the comma in the field then it adds the next column, another comma, and then part of the next column. It then moves on to the next column and will insert everything correctly until it gets back to the first column again. There are a total of 66 entries and only the first one inserts correctly, all of the remaining ones string together the first 2 or 3 columns.
Image 4: shows the import rules I set when importing - these are the default settings. I do this import every day and it has always worked, but stopped working after December 5th.