The forge isn't working correctly. Some of the conversions/trade are not appropriate.
Got Mudstone[45HP] for 3 Gravel [55HP]
All the [common] blocks give Grass
Yeah, the forge has some strange interactions in the last version. I'm working on fixing/balancing/making better the forge in the next version so we don't get weird things like these popping up.
Thanks for the report!
