Not only just this time they are playing good at their home ground I saw their previous match on their home play ground and what I've seen is that they've consistently done well in those matches except some few match. And I think with that consistency they were able to beat India and take the series in their favour. I also thought that they also hold the ability to win 3rd ODI and make whitewash India.
Third ODI will be played in a different venue. Pitch condition will be different there. I think Indian players will do better in that condition. Bangladesh had won the previous ODI series against India by 2-1, It was played in 2015. Probably this series will end in the same way. Indian players will get huge pressure from their cricket board if they lose the third ODI as well.