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The color may have intensified because of the temperature, sunlight or nutriton and might become lighter like you hoped. This article explains:
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-turning-different-color.htm

Possibly a greenish, hibiscus sawfly larvae damage. Early on humid mornings, you can find their greenish larvae on the bottom of the leaves, chewing between veins. Because they are not caterpillars, they cannot be controlled using organic pesticides like Bt (Bacillus thuringiensis) but you could try spinosad (apply when bees are not active). For a bad infestation, you can also try hand squashing, insecticidal soaps or a systemic insecticide like Imidacloprid. They are most effective if you start applying in May-June per label directions. The damage is typically aesthetic only and would not normally kill the plant.

Not sure which rose mallow you were interested in. These articles should help:

https://www.gardeningknowhow.com/ornamental/water-plants/swamp-hibiscus/swamp-hibiscus-plant-info.htm

https://hgic.clemson.edu/factsheet/hibiscus/

https://aggie-horticulture.tamu.edu/wildseed/35/35.7.html