This is a very weird transaction, clearly not really possible:
It looks like this bug known in april: Should an address be restricted from sending unlimited XLM to itself?:Quote
While testing our wallets yesterday we noticed that an address is able to 'send' itself more XLM than the current total supply limit, ex: 105 Billion XLM. Although the net result is simply paying a transaction fee as the account is debited/credited at the same time, the transaction does appear on explorers.
Nothing serious. It's like saying you're going to pay yourself 99 billion dollars 