Okay you need to view your server's error logs and find out any clues to what is happening if you continually get an issue.
My bid went through with the second click.
Now the html of your bid form is just fine. My suggestion to you is to disable any and all hacks or mods you have to vbulletin. Especially anything that has to do with redirection. Thats why I state to view your server error logs. You need to know where the system is trying to send you if its not to bids.php. Our form is clearly sending you to bids.php and if you are sent to bids.php you will be fine. So we need to try and track down here what is the external factor interfering with the process.
Code:
Content visible to verified customers only.