The design of the Philippine flag is very unique compared to other nations. Philippines doesn't have a separate war flag but the same national symbol can serve its purpose. To indicate a "state of war", it is displayed with the red side on top as stated in Wikipedia.

Unfolding the history of the inverted Philippine flag

These are some of the important timelines as to when this set up was observed.

During the Philippine–American War from 1899 to 1901, the inverted orientation of the Philippine flag was used. Similar case happened during World War II and coup attempts during Corazon Aquino's presidency. 

In 2010, the Philippine flag was also hoisted in New York with the red color on top.

This could not be a huge concern to liberated citizens but Philippine patriots nowadays are starting to increase from the time that President-elect Rodrigo Duterte was seen kissing the national emblem during his nationwide campaigns.