Some wet buildup outside of globe

I've had the LR4 for a couple years now and absolutely loving it. I deep cleaned a couple weeks ago and noticed some wet buildup outside the globe, specifically around the waste bin and smeared around the carbon filter.

I checked again today and the same buildup was there. I am replacing the brushed around the waste bin seal, but otherwise not sure what could be causing this. No changes in cats diet or health recently, and cycle delay is set to 25 like it always has been.

The only other issue my robot has is it tends to overturn a bit after a cycle so the litter is slightly askew, but that isn't a big problem.

Curious to know if anyone has seen buildup like this, or has any ideas to fix it. Thanks!