When you level up to an even level, you will complete a "cultivation quest" which give you some amount of rewards. This is the quest that level-blocks you from doing further plot instance btw.
So if it was an odd number level, you won't be getting anything of the sort. (alternatively, if you haven't finished all the main plot quest yet and aren't blocked on the "cultivation quest", you also wont get anything)

You do get a level up message every level, but that have no reward in and of itself.

but the message i got did contain a reward of exp and coins, was it a bug?

omg on the lvls were they call it training like lvl 61 to 62 u start off wth no exp at 0% but at lvl 62 for doing that they give u some exp and coins. then at lvl 63 they start u off again at lvl 63 with 0% exp till 64 then when u get to lvl 64 u will get some exp and coins.