when i copy any address, the result always is: 1K2k7q3bHvFntdmPECWgAK3mVeb4tfNAwf
but this wallet is not mine.
can you help me to fix this issue?
thank you so much.
What do you mean? Is it something wrong with your keyboard or device? Personally it sounds like a virus to me.
What wallet are you using? I have experienced something like that they first time I used and exchange wallet. It didn't let me change my transaction address. I found out my internet server was glitching and the exchange was also having troubles. But afterwards I switched to another wallet. If you don't have any funds in this wallet, switch to a trustworthy wallet like Electrum.
Maybe, try and find tools in your wallet and click to get a new address. The wallet should generate for you a new and available Bitcoin address. You can transact Bitcoin to this address and it will end up in your wallet.