Thanks, glad to hear somebody had the same issue and then solved it. It's the first application of the day though ( I sent 2 other applications last week and still pending). I also called the support and they said they "never heard of this problem before", suggesting me to try again later. I read somewhere that adding a space after the passport number solves the issue, however they must have updated their interface now since you cannot insert any space in the passport field.
I will try again tomorrow hoping it will go through!