unexpected transactions took away my balance when sending BTC

[idoordo]

Hi All, I am new to Bitcoin, I opened an account from Coinbase, so I tried to send $3 worth of BTC from another wallet to my coinbase wallet address on May 22, finally I checked my coinbase account, and I did receive this much BTC in my coinbase wallet, but all my $10 worth of BTC were gone on the same day, when I checked my sending wallet with this site:
blockchair and this address: 1PHTygJ8ba6oA3EkRiRA9BvErxPE9bVMAQ
I found there are three different transactions went through on that day (May 22), and none of the transactions has my coinbase wallet address, and I only sent one time with one transaction, why are there three unexpected transactions taking away all my balance of $10 worth BTC, I am afraid I could lose all my balance if I had much more in my sending wallet.
Could anybody explain what was going on?

Thanks!

[bitkilo]

Screen Shot 2019-06-01 at 3.15.53 PM.png

Hi All, I am new to Bitcoin, I opened an account from Coinbase, so I tried to send $3 worth of BTC from another wallet to my coinbase wallet address on May 22, finally I checked my coinbase account, and I did receive this much BTC in my coinbase wallet, but all my $10 worth of BTC were gone on the same day, when I checked my sending wallet with this site:
blockchair and this address: 1PHTygJ8ba6oA3EkRiRA9BvErxPE9bVMAQ
I found there are three different transactions went through on that day (May 22), and none of the transactions has my coinbase wallet address, and I only sent one time with one transaction, why are there three unexpected transactions taking away all my balance of $10 worth BTC, I am afraid I could lose all my balance if I had much more in my sending wallet.
Could anybody explain what was going on?

Thanks!

If the address you provided (1PHTygJ8ba6oA3EkRiRA9BvErxPE9bVMAQ) was your original Coinbase BTC deposit address, then it looks like there has been a few small withdrawals after the first 2 deposits, with the change going back to the same address each time. I am not sure whats going on, but you can see it all on the blockchain here: https://www.blockchain.com/btc/address/1PHTygJ8ba6oA3EkRiRA9BvErxPE9bVMAQ

Because they are BTC transactions, there is about $1.70 in tx fees, although i am not sure that Coinbase charges the users the fees or not.

Please contact the support team at Coinbase, they will be able to look into your account for you.

[mayke sanches ramos]

Eles transferiram todo meu dinheiro para uma carteira desconhecida 17zA1CZU8FuwmxCtSvrzXs8rYRkB4q8kZw não sei de quem é essa carteira eles roubaram todo meu dinheiro que venho juntando a anos minha moeda estava em BCH no total de 4.906396 BCH porque voces fizeram isso estou me sentindo um lixo voces roubaram tudo que eu tinha por favor me devolvam meu dinheiro

[idoordo]

Thanks to both of you for your answers, on May 23rd, I was sending BTC from this wallet address 1PHTygJ8ba6oA3EkRiRA9BvErxPE9bVMAQ to Coinbase (so 1PHTygJ8ba6oA3EkRiRA9BvErxPE9bVMAQ is my sending address) , I was expecting one transaction, but somehow three transactions happened, and none of the transactions has my coinbase address, in other words, my Coinbase address is not the receiving address in the three transactions, and all the balance ($10 worth of BTC) was gone, so I worry what could happen if I had thousands dollars worth of BTC? I could lose all of them, so why are there a chain of transactions happened?

Also mayke, I only know English, so I do not understand your answer, can you or anybody translate your answer to English?

Thanks

[gromik]

Thanks for the detailed description.