On SORA Network each token has an unique identifier, the ID Address. It works similar to Ethereum, where each token has a contract which starts with 0x...
Note that every token which has a grey icon is not official, and you should be very careful about them.
Incompatible tokens: OMG, USDT
Disabled tokens: BAT, HT, CHSB and cUSDC
Furthermore, not all erc20 are supported yet, send through the bridge only the tokens below.
Before making a trade on Polkaswap, be sure that you've selected the original tokens with icons: