Hi @Ibrahim_Goksu, sorry to hear about this issue. From the screenshots, it looks like your ‘Start Date’ and ‘End Date’ columns have different formatting. To ensure the data is read correctly by Asana, please adjust the formatting to the standard US date format (month/day/year). You can find more details about preparing your data in this article.
If the issue persists, please contact our Support team and include the CSV file in your message so they can investigate further. I hope this helps!