I found the culprit of tile overlapping today. It was the global footer. And the next one is recent posts I used in Sidebar. It was showing that there is no post in last day, week and month. Also I am still not able to feature the posts. :(
The tile overlapping should have been fixed in the latest versions of Lavender... perhaps that explains it?
I guess widgets will get better in 0.5x :dream: