Hi Codrina Merigo,
Greetings from Syncfusion, we have validated your query and we like to explain our DateTime axis behavior in detail below.
DateTimeAxis is used to represent the data over X-axis linearly and the intervals for the axis is based on the minimum and maximum range set to the axis based on your data, for e.g. if your data represents more values between a single day then the interval type will be automatically calculated as hours and you will have label based on hours interval (likewise for years, months, days etc.). Since we cannot predict the data linearity the labels will not be placed exactly over the data, instead it will be placed based on the range and interval calculated for your data.
Even in your screen shot you don’t have the data placed in a regular interval, every data is on different time intervals. To see what data placed on what date you can always user our Tooltip / Trackball in chart, below is the reference on how to use tooltip or trackball.
Have said that, we also have another type of axis called DateTimeCategoryAxis, which is used to display the label for each data with equal space and not in a chronological order. You can refer more on that from the below link
Also, we have prepared a simple sample using DateTimeCategory axis for better understanding and you can download it from the below link.
Hope this helps.