Thank you for contacting Syncfusion support.
We are unable to reproduce the issue in our latest version 14.1 of Essential studio. We have shared the sample by setting text with prefix (‘) to text property which can be downloaded from following location.
Kindly share us the issue reproducing sample along with your current Syncfusion assembly version which will be helpful for us to provide you a prompt solution at the earliest.
Please let us know if you have any concerns.