Are your UUIDs generated client side or server side? If it's client side, it could be due to a crawling bot. Googlebot for example executes Javascript using deterministic "randomness".
Googlebot's lack of randomness was the conclusion of a previous incident for that package https://github.com/uuidjs/uuid/issues/546
Googlebot's lack of randomness was the conclusion of a previous incident for that package https://github.com/uuidjs/uuid/issues/546