I can not enter the address of the cryptopia wallet in the browser of my desktop computer. example: the wallet address cryptopia - 0x7bb9cb5b261d2471aadcf441857f86c980f722de, and I have a wallet - 1GiKXvfQqMCPpDNrFJ2cEof5CcvDAjRZm2. Is there a problem?

I think you have found the problem. Coinmarketcap have incorrect information. DOT on Cryptopia is an INTERNAL ERC20 Ethereum token that trades only on Cryptopia, and was created only in 2017, but CMC lists Cryptopia as the webpage of the DOT token. Meanwhile CMC lists *this* bitcointalk page as the announcement page for DOT, but I realise that this DOT is a blockchain with Scrypt mining (like Litecoin and Dogecoin), completely different to what you can buy on Cryptopia.
I presume that CMC have confused the two coins, and the early chart data relates to this coin, and the later chart data relates to the Cryptopia ERC20 token, which is, of course not mineable whatsoever.
One would have to look elsewhere to find where Scrypt/Dotcoin might be traded. I couldn't find a link on the CMC page to report the error.