Greetings from Syncfusion support.
We have checked the provided scenario in the EJ2 TextBox component in Linux Mint OS. Unfortunately, the reported issue is not occurring at our end. We have prepared the sample and video demonstration for this case and attached it below.
Also, while checking this issue in the Linux forum, this may be caused due to system settings. So, please make a try out the solution in the below forum to get rid of the reported issue.
Still, the issue persists, please revert us with below details that will help us to check and proceed further.
1. Issue reproducing sample (If possible)
2. Code example
3. Whether the reported issue occurs in HTML 5 TextBox component or Syncfusion EJ2 component alone?
4. Any overriding the CSS styles for the TextBox component