Re: warped osb
Howdy, do you have a humidifier on your furnace? Turn it off. Have you checked the amount of humidity in the house in the winter is it below 40%? Do you run the fans when you: shower- leaving it on for 15 minutes after your done, wash clothes, do cooking? How tight is the house? How were the walls insulated? How is the finish applies to interior an exterior - ask builder how permeable the finishes are.
Consider checking the attic for signs of condensation damage.
Is the attic properly vented? More venting at the soffits then at the roof peak?
Lady bug smell? Sounds like fungus growth! Consider having some of the walls and ceiling s opened in that room to observe what is affecting it.
Any an all of my comments are just my opinion and not to be confused with facts.