Pardon? Why didn't you save the original in a lossless format and do the compression once? What you have done introduces quantisation errors which compound with more quantisation errors and so forth. It will (and has!) produce a total mess.
Yeah, but you're the crazy uncle we keep in the attic. We're not quite sure why we don't send you off to one of those places crazy uncles don't come back from, but so far we just haven't gotten around to it. So far.
Maybe we just think that every family should have a crazy uncle that lives in the attic, and if we didn't have you we'd have to train up another one. And, frankly, that'd be a lot of bother.