@Jack1480
The airbnb site seems to be experiencing a whole swathe of technical glitches at the moment. I'm assuming this is yet another one.
Hopefully it will soon be sorted.
In the short term, if I were you, I'd be sending a query to teh host of the place you were intending to book, letting them know what you are experiencing.
Tell them you are VERY keen to book and have tried multiple times but that the logarithm is playing up ad not allowing you to proceed.
It may not do you any good, but it can't hurt - the host may consider holding the dates for you, especially if it's not too soon and the problem does not last for too long.
Other hosts may have further ideas.
Good luck!