Thank you for contacting Syncfusion support.
If you still face issue from your side, please provide us the below details which will be helpful for us to proceed further in this.
1. Modified of sample of above along with complete code snippet.
2. Highlighted screenshot of the issue in generate PDF.
3. Syncfusion product version which used at your end.
Note: If you have any confidential data in your code snippets, please replace with some dummy data and provide us the same. We just need your code example to recreate the problem you face.
Please let us know if you have any other questions.