that number shows how much times you will get your money if you bet on team
if you bet on bbl you will get monet 3x
and1.25 something if you bet on drx which most likely will win
That's not how it works. If you bet 1$ on DRX and they win you get 1.25$(original bet +0.25$), while if you bet 1$ on BBL and they win you get 3.5$. Meaning that the chances of BBL winning are lower according to this betting site and DRX are the favorites with lower multiplier.
Its multiplier 1.25 x your bet or 3.5 x your bet. 1 x means you get original money back and then rest are extra you gain. Higher chance for team winning the lower the multiplier for them is.
That number indicates return ratio
So if more people bet on DRX then the money from BBL bettors will be divided among a larger number of people (DRX bettors) therefore lower return for each DRX bettor