Human mistakes happens despite being a pro or newbie. Sometimes gambling requires a lot of thinking and thinking of ways to win and strategy. Thus making you press unnecessary buttons.
I even tick the odds percentage unknowingly, and wonder why my bets keep losing. I think gambling sites should add another warning popup message, so that when a users mistakenly clicks "double bet button" a warning sign pops.
I doubt that gambling sites will implement it though. I mean how do they know that you click it by mistakes. I myself did a lot of mistakes not just in roulette but many games and most of the time I was late when I realised my mistakes. Maybe there are few occasions that it bring me more money because of that mistakes and I'm glad that I was lucky then. But everyone should be cautious and not get excited and just started to roll, check your bets first before you regret everything.