Not sure what’s happening in the videos you linked to, but MP3s might be a different master (and louder initially, but less so after youtube interference) since streaming sites are pushing volume up or down based on how loud it is with specific LUFS targets or similar, so for a streaming site that pushes your audio down to -14 LUFS you can make a different master that is already at -14 LUFS (if you release DNB on something like Hospital Records the MP3 master still might go up to -5 or -4 LUFS), see this thread for more on that topic. This might also affect the Youtube processing.
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