To double check: 1) open https://iancoleman.io/bip39/ then go offline (opt.) 2) enter mnemonic phrases 3) choose BCH coin 4) choose BIP 32 tab 5) enter m/44'/0'/0'/0 (extra /0)
Check if the addresses listed here matches the one in Electron Cash on iOS. If they are the same, then you did your Electron Cash setup correctly and we'd have to look deeper.