Censored? Who changed my default posts from public to friends?

Censored? Who changed my default posts from public...

Censored? Who changed my default posts from public to friends?

.

.

All my Facebook posts from March 8th through today,

every single one for the past 21 days,

had been set to friends only
- public default was turned off and it was not by me.

All posts from March 7th and prior were still marked as public.

When I went into settings the default had been reset to friends only.

WTF?