Hi, thanks for your message.
Changing the form structure that affects the dataset of your form, indeed results in separate CSV exports. All results with the same dataset structure are bundled together.
Of course in total all your collected results should be included in all CSV files all together. Are the results that you miss in the CSV’s available in the results list inside the plugin itself? If so, the results are stored correctly in the first place and we’ll have to investigate further why some of those are not included in the CSV exports.
If you want us to take a closer look at your case, we can have a look in your WP-Admin. In that case, please contact our support at https://tripetto.com/support/ and provide us a login. Please also include instructions in your support ticket about in which form this happens and an example of a result that you miss in the CSV exports.