We don’t do any loudness post-processing to your audio (unless you opt into our Loudness Normalization extra), we simply deliver it to streaming services as is, and they decide how it should be played back.
You may need to Google around for what changes services make to audio files on their end - each service is different, and offers different audio formats to fans.
Best practice: Submit a high-res copy of your songs to us, and let services convert them to their liking.