This may happen due to numerous reasons.
Make sure you have selected the correct delimiter for your CSV file.
If your CSV file is semi-colon separated, make sure you select "semi-colon" in the delimiter setting in CSV preview.
2. Make sure that your CSV file does not have too many columns.
Our back-end architecture can handle up to 10,000 columns for a table. However, we recommend limiting your table within 1500 columns for the best front-end experience. Any table with more than 1500 columns would cause delays and slow-downs in rendering on your Acho Studio.
3. Make sure that you have selected the correct datatype for each column
We have an automatic system that detects the column type for your table. Please refrain from making manual changes.