Hello @Beam1978 Sorry to hear about your recent experience. Here are the possible reasons:
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You shared your 12 words (via phishing, social engineering, etc.);
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You saved your 12 words in a very bad place;
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Your device is corrupted with malware;
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Someone had physical access to your device;
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You entered your recovery phrase on a fake/clone app.
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You transacted with a malicious DApp.
Unfortunately, confirmed transactions at blockchain are irreversible.
Please read and understand this:
https://community.trustwallet.com/t/my-recovery-phrase-has-been-exposed/22405
Learn more about how to protect your cryptos and new wallet: