Hi,
We’re sorry for the inconvenience caused by the problem.
From the description provided, we understand that suddenly there were unexpected symbols in Word document which you’re using from long ago. So, when we tried to search about this, we found a thread with similar thread where the problem encounter when the
document contains a font i.e. is not installed on your Mac. For you reference, you can refer to this article:
The document I opened contains unexpected symbols
and characters and check the outcome by trying the solution provided in it.
If the solution in article doesn’t help, please confirm the following scenarios for moving further:
a. Does this problem happens to specific Word document or all the documents?
b. What happens when you try to change the font? Does that make any difference?
c. Your Word application version. (Open Word application> Click on Word in Menu bar> About Word)
Appreciate your understanding.
Regards,
Chitrahaas