That seems like a side effect of the global crash in interest rates: People buying homes with cash are currently competing with borrowers with much less than 20% down and low interest rates.
btw, this is somewhat intended, and is the reason the Fed dropped rates to zero in the first place. If assets were not reflated, the recession would have gone much deeper. Unfortunately, "assets being reflated" means, as one example, people buying assets (homes) with cheap money.
It will be interesting as rates return to normal and the Fed starts to shrink its balance sheet later this year.