Jumping odds

Hi everyone.

I'm building my own app and the first thing I'm trying to do is to get prices. The problem I'm having is that prices are jumping enormously :(

Please see the video below:
https://www.youtube.com/watch?v=zrfC64YUHe0

Odds for a market can jump between 2.11 and 11 easily and I have no clue what I'm doing wrong. Do you have any suggestion?

I am using a delayed key, that's why my odds are different from the Betfair odds on the screen. But I think it should not be jumping so much.

Any advice on this issue?