No, never heard of users just disappearing. Do you've CB Privacy installed and the delete me feature enabled? If so they probably deleted themselves. Alternative is one of your moderators probably did it.
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Unless you made a database backup there is no restoring them. CB doesn't spontaneously delete users either unless you've configured something to allow doing so. CB Privacy notably has a delete me feature and CB Auto Actions could potentially delete a user with a Code action, but you'd have to utilize that API. Aside from that there's no other frontend user delete usage. You may want to review installed 3rd party extensions as they could potentially delete a user.
Check within the _comprofiler database table and see if their user row still exists. If it does they were deleted from Joomla _users only and not CB.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
Read FAQ thoroughly
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Read our Documentation
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Search the forums CB links:
Documentation
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Localization
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CB Quickstart
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CB Paid Subscriptions
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Forge
-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
-- If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
send me a private message
with your thread and will reply when possible!
-- Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.