Strange sepia effect

I've made my first map using OSR Dungeons (attached). For some reason - I can't figure why - it has this sepialike coloring. I've tried hiding sheets one by one, but the glow didn't disappear even when all sheets were hidden. Any suggestions?
https://drive.google.com/file/d/1ItuF96DK7ZBd_Skhr6uSGkBoUhDmK0uX/view?usp=sharing (238 KB)

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