You should try using Preview when opening your csv file. It will let you see what JMP is doing with the data
- Go to File=>Open
- At the far right, lower portion of the window, click on the File Type drop down arrow and select "Text Files (*.txt,*.csv,*.dat,*.tsv)
- Select in the "Open as" area, "Data (Using Preview)
After you select the file you want, and click on Open, the Preview Wizard will guide you through the .csv import process, and you will see a preview of how JMP is interpreting the data
Jim