I am attempting to enter a snipe on ebay item #391678754048 and it keeps coming up as an invalid number. I have triple checked the item number and this IS the item on ebay.. what is going on? is this a new way to prevent sniping? Please help - auction ending soon. If you can fix it, enter a snipe for this item for $130. Thank you.

I tried it in your account and it goes through the second time. Can you confirm which browser and OS you are using? Thank you.