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There is a major major bug in Contacts app, multiple numbers are sync with one contact,other contact's number displayed in other contact,it's major bug, please fix this.
Redmi note 3,MiUi 7.7.20 version
Can you check the same contact in your account from web browser and check if it is showing correct there.
And also do generate a bug report from your device by dialing *#*#284#*#* and attach it to reply from Mi community desktop site advanced mode in reply box.
Bug report will be in storage/MiUi/debug_log/bug report zip file.
Please do sync the contacts from the Google account and check the issue, this happens due to syncing issues of the contacts from the cloud, do remove all the contacts and sync from the Google account which will solve your issue.