Odd smell from mix and help potting a Zygonisia Cynosure

[Syrinth]

Hello, I was going to repot my zygonisia cynosure today and when I went to get my mix that I had left soaking I noticed a strong smell similar to that of manure. Additionally, the mix is comprised of a LOT of very small pieces of perlite and very large bark chunks.

I left the mix soaking for about two weeks unintentionally, things kept drawing my attention... could this explain the smell?

I'm concerned about whether this mix is safe to use, or if I should just scrap it?

Lastly, any help on repotting the Zygonisia Cynosure would be greatly appreciated, I'm a total newbie...