Areas should not overlap, or if they do, the larger area should be fully enclosed.  For example, I fixed this one:
https://www.openstreetmap.org/way/1192129272
They partially overlaped when you did it.  The system can not determine which belong on top, so it throws error flags and alerts others that there is an issue.

There are 2 ways to do it:
1) Don't overlap.  Have them either touch or not touch, but no overlap.
2) Have the "bottom"/"larger" one go completely around the smaller one.  For example, how the tennis courts (smaller) are fully within the part area.