I can't explain it because I don't understand what you're saying
Do you have example spreadsheets in both formats to demonstrate the problem you've found?
Can you provide some working code to help explain what it is that you're reading, and what exactly you expect to see?
Do you have example spreadsheets in both formats to demonstrate the problem you've found?
Can you provide some working code to help explain what it is that you're reading, and what exactly you expect to see?