compost smells like....brownie batter?

exactly what the title says. i am very new to this. i bought a lomi secondhand, which dehydrates and grinds food scraps into [pre]compost. i try to mix it with sawdust or shredded paper before turning on the lomi to try and balance out the ph and carbon.

thing is tho, that when it comes out of the lomi, it smells very strongly of umami. like ultra tomato paste. but now that it's been a few days with the worms, i've aerated it out, and now it smells like something really similar to brownie batter. afaik i haven't put any brownies or any other baked good in there. is this a bad thing? are there any worm scientists out there?