There is a possibility your gauge is kaput too. You could move it up to the front and see if it goes up to the 90's like the others. Acurite Digital hygrometers work good but I have had them occasionally malfunction. Like the one my snake just dumped into it's water bowl. Had to replace it. It is good to check them side by side to see if they are all working and showing the same numbers. One time I kept misting and misting come to find out it was a bad reading. When I replaced it the humidity was great.
Not saying what you said can't be true. Like one said the uth could make it dryer at the back. You should read the other thread about spiking humidity to get some additional tips and info.
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