How do I backtrack an ETH wallet?

enter image description hereenter image description hereI had some ETH deposited into my account from a wallet. However, ALL the ETH was supposed to be deposited and I am not sure it was. When I click on the "from" link, that wallet shows that it had way more in it than what was transferred to me. I’ve attached a highlighted "from" address. When I click on this, I’ve attached a partial screen of what I get. Did that wallet really have this massive amount of ETH on it?
Wallet1 Image shows the from-to.
Wallet2 shows what I get when I click on "from" from the previous image.