Most issues with the 12 words seed phrase restore process are related to a typo. Try checking the grammar and entering it in again a few more times.
Please visit the Bitcoin BIP39 GitHub page to double-check the grammar in the seed phrase back up you have. Use the browser's Search function (Cmd+F on Macs; Ctrl+F on Windows). Write the first 4 letters of each word into the Search function's field to check if you got one wrong and then try restoring your Liquality wallet again.