The blurbs have it wrong. The Philippine Flag has no right side up or up side down. The flag's designers envisioned equality in the flag. So whichever side you fly it, it should not matter. However the Flag is unique in that it is the only National Flag which by flying the red side up, becomes a War Standard. Of course we Filipinos want the nation to be at peace. So we would want the blue side up. But the red side up was first hoisted during the Revolutionary War against the Imperialist United States of America (to show that a Sovereign Nation was at war) which eventually crushed the Philippine Republic. The American occupiers banned flying the National Flag blue or red side up for 12 years from 1907-1919 on pain of stiff jail terms, fines or even death. This is the time when the flag could be displayed either covertly or as part of Zarzuela costumes. The red side was also up when the Philippine Commonwealth was invaded by the Japanese in 1941 and the Field Marshal...
"It is surely harmful to souls to make it a heresy to believe what is proved" - Galileo