it is not a bug, the site automatically does that to notify u when u wager a particular amount. my point is this thing is affecting peoples game play. most people dont like to be stopped or slowed down till they win or bust. refreshing the page in the middle of an active session against the players will is unacceptable.
I play auto bet for about 8-10 hours every day but never face such problem. I think you should record a video and send it to the support team so they can verify the problem and fix it.
If you are experiencing such type of problem then yes, it is a bit annoying and it should not be.