When you use YYMM (month in the format of 2-digit year and 2-digit month) as x-axis, the chart may look like below. That’s because the system treats YYMM as “Timeseries”.
![Seats by YYMM](https://flightbi.com/wp-content/uploads/2021/07/image-3.png)
To solve the problem, click on the Settings button, select Axes in the chart options and then change X-axis scale to “Ordinal”. Then the chart will read correctly.
![Seats by YYMM](https://flightbi.com/wp-content/uploads/2021/07/image.png)