Welcome pleaky!
That’s a side effect of removing the need of a builder to finish simple objects. I wanted the campfire and charcoal pit to start just by placing stones or firewood (without a hammering and sawing builder guy). Since it often leads to confusion, I tend to add a builder again for at least 1 turn and did already with the stone fording for 7.1.
The event log shows seasons while in overview you can choose your style. I can’t connect the log with the overview but can change it to modern months if most people prefer this.