@Keeley *******
Yes, the Thai e-visa system has you upload your photo page of your passport. The system will read the photo page and overwrite anything you already entered related to names, dates, etc. You might not even realize it overwrote what you had written. Their software is notoriously inaccurate, making mistakes. You might have entered the letter O, but then the software scanned your photo upload and changes it to a zero, which is not what you wanted/correct. If you don’t notice that this change (error) happened and submit, the embassy will cancel your application, stating your data is incorrect, even though it was their system that messed it up and overwrote your correct data. So upload the photo page first, deleted all the fields it populates and re-enter with what you know is correct