Were those wallets generated with TronWalletMe (former version of Klever wallet)? If yes, that’s most likely the reason.
Some wallets started to get drained some time ago and what I understood from some devs discussions is that it’s linked to the old version’s seed generation library randomness.
Our team developed the wallet, about 5 years ago, for generation address they are using :github.com/iexbase/tron-api
and private keys store on a secure location with encoding with pin code ( 8 letters at least )
there are a lot of addresses not only mine addresses, check this address activity TTouPrmjX3nzUiy8PHGyL21J6pmiVkG8u8
Well I’m not a dev so I’m not sure what I say is relevant but maybe you’ve used the same library that the one used by TronWalletMe to generate seeds?
@SimbadMarino you’ll be more helpful than me for that 
Im not familiar with the team/repo, but checking the repo it seems like not actively maintained, as precaution please move any wallet assets generated by that API to a secure wallet to prevent further losses
Hello world! Glad to be here.
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Is this really zilpay wallet for zilliqa 2.0 tokens? You’re welcome btw
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All the best to this Forum 
Abubeker Mohammed
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