Hi @weimingpoh
If I am not wrong, then you are using AutoCAD 2018. This is a known issue in AutoCAD 2018. The text crumbles as you have shown in the screenshot when the "Arial" font is used. This will not affect the PDF output and it would look fine in the PDF. You can correct this issue by updating to the latest update available or change the font of these text from "Arial" to "Arial baltic" 🙂
--------------------------------------------------------------------------------------------------------------------------
ವಿನೋದ್ ಕೆ ಎಲ್( System Design Engineer)

Likes is much appreciated if the information I have shared is helpful to you and/or others.
Please mark "Accept as Solution" if my reply resolves the issue or answers your question, to help others in the community.
--------------------------------------------------------------------------------------------------------------------------