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If what you’ve said is accurate and true :
1. Someone knows where you hid the seed
2. The external harddrive when connected to your computer got picked up by malware or Spyware and the seed exposed
3. Your phone is uploading to your cloud without your knowledge and you have a poor or reused password with weak 2fa or no 2fa
4. You have an app on your phone with privledge to your pictures but it’s malicious in nature and extracted your seed