Food vs Poop consitency

New hedgehog mommy here, I have been feeding my hedgies a combination of Wellness Healthy Weight, Innova low fat cat food, and Royal Canin indoor mature 27. They both have gone from solid little poopies to more of a mushy toothpaste consistency, still formed, but not quite as firm. They tend to make a bigger mess on their wheel at night than before. Does anyone have any suggestions or recommendations on how to firm things up? Not sure where to go with their food mix, or just keep on keepin on. When I brought them home they were on 8 in 1 and I slowly transitioned them over to the mix. It just seems recently that they've been a little softer than they were before.

Thanks for any help