Temp of 67and RH of 67 is just about where I want mine.
If it were me, I would leave any sealed boxes/coffins sealed.
You don't want rapid change, and the box will act as somewhat of a stabilizer/flywheel to prevent rapid changes in temp and RH from occurring,
Don't forget, you are only measuring the RH and temp of the air at one point in the box, and at one point in time.
If you have not done so, suggest you calibrate your hygrometer. Everyone has their preferred method for doing so, mine is to use a standard large boveda pack as close to the RH I want to hold as I can pick up, put it inside of two ziploc bags for 36 hours actually inside the wineador in order to be at the same temp.
Take your time, give it days for the wineador to settle in, and days to settle in if you make a change.
These things fluctuate a bit, the cigars have to stabilize, the boxes/trays have to stabilize.
Take it easy, give it time, then more time.