RMS goes up after sending it

Hello! I have been working on an audiobook for someone else, and I put it into a Google Drive for them to submit to ACX. Once they do, ACX tells them the RMS is too low, but it looks just fine to me. Does anyone else have this problem?

I don’t.

How are you measuring the RMS?
What is the RMS level according to your measurement?
If you download the file from Google Drive, does it still measure as the same RMS level as before you uploaded it?

How are you measuring the RMS?

In detail, please. Measuring RMS is not for the easily frightened.

I predict (pressing fingers to forehead) you are going to fix the RMS (loudness) of the chapters and they’re going to stop passing ACX Noise and possibly also ACX Peaks.