Sorry, this wasn't a bug, but I do think the text on the card is misleading. It took me a while to figure this out because Factory has seldom gotten into play. If I understand correctly now, what Factory is calling an "Energy/Tool group" means one Energy tag anywhere plus one Tool tag anywhere. I think this would be clearer if it were written Energy+Tool instead of / (which I read as "or"). The way I originally read Factory, I was looking for groups of "Energy or Tool" tags. For example, I expected that Oil would count as one group because it has three Energy tags.
Anyway, great game! I've been playing it a ton and will definitely be picking up Smol Gods.