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Contact cards show phone number that doesn't exist as an attrribute
We have a few users whose contact cards are displaying phone numbers that do not exist on their accounts or contacts. These phone numbers did previously exist on their AD accounts but were corrected ...
Found the solution after much searching. We needed to add some address book normalization rules to reflect some of our extension number formats that are different in some locations from our default. Phone numbers then corrected themselves on contact cards
Are you using Outlook/Skype on-prem or Online? If online, did you check the attributes in O365? There may be some data not syncing back to your on-prem AD.
Been there :-)