characters appearing in database values & increase 2x time everytime retrieve from DB

MongoDB Atlas App Services & Realm
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1

       ← these characters keep appearing!

every time retrieve from database.

Unwanted special characters added automatically

String "Hello: " is stored & retrieved from DB it will changed to “Hello:”
Space character changing to  this circumflex accent.

whenever retrieving the data from DB it will appear like 2X times “Hello:”

please suggest some solutions

2

Looks like a bug in your code.

Please share your code that store and retrieve.