~snip~
Probably wallet's like Blockchain.com. For some reason those are the wallets newbies first get to know about before they even know about a wallet like Electrum. I must admit that, Blockchain.com was the first wallet I signed up for thinking it was the best wallet out there. Maybe because of the strategic nature of its name but most of the newbies fall for it and think it's ver safe.
Or, most likely, Bitcoin.com. It seems OP doesn't know even the basics when it comes to what Bitcoin truly is. From this, we can surmise OP could have thought Bitcoin.com is the official site or wallet of Bitcoin.
If I'm not mistaken, Bitcoin.com users could also maintain a wallet from the site itself, not the mobile wallet app that's downloaded to either iOS or Android devices. Since Bitcoin.com generates a fresh address for every transaction, OP must have been confused when his/her address in the dashboard changed.
I hope OP comes back here to make clarifications or learn a thing or two about Bitcoin.