All those problems are probably a result of compression. This time, it's not the usual data compression involved in the conversion from WAV to MP3 or whatever, but the dynamic range compression that is used in the mastering process- not always very sensitively, I have to say.
If you have a delicate reverb on a recording, and then all the loud sounds are reduced in volume, and the general level then boosted back up, the previously quiet reverb tails will be more prominent. The crescendi and diminuendi could vanish altogether, or, if the compression were extreme enough, they could appear to reverse.
With Youtube it is data compression that is the problem.
You need to speak to the mastering engineer.
Cheers
Dave