I am going to Colombia in early September. I wasn't going to do the form until nearer the date but given the OP's experience I decided to do it now. I had a similar experience to his. I could not fill in some of the fields, but carried on regardless, doing what I could, I then got a page saying that my pre-registration had been successfully generated and that an email had been sent to me. I checked the email and the document had my wrong date of birth and flight. I'll try again nearer the date of travel but if I don't get any more success I will go with this document and hope for the best. Presumably, staff at the airport must be used to these problems but I look forward to hearing how Lucas61 gets on.