Dehumidifier produces 100 g of water every day. No effect on relative humidity
Using calculations for a &quot;sealed&quot; room isn't going to work unless you've actually sealed the room. (Do not actually seal the room.) Otherwise, moisture will seep into the room around the door, plus whenever you open the door, as well as various other pathways.
A person generates (according to the Internet) 50-90 grams of water vapor an hour, so the dehumidifier isn't even keeping up with your output.
Now, the dehumidifier should be doing more than it is, especially at that level of humidity. You should be able to get numbers for your dehumidifier that tell how much water it can remove from the air at a given humidity level. It probably needs some cleaning or repair.