It is safe to say that life in the Philippines was quite chaotic in the mid to late 1890s, between The Philippine Revolution, The Spanish-American War, and The Philippine-American War.
Prior to the overprinted US stamps issued in June 1899, ordinary US stamps could be used at US Military Postal Stations, here is an example (via e-bay) from February 1899.

That said, the FELIPINAS marking could have also been applied on an incoming postcard or letter from mainland USA to the Philippines during Spanish administration, for example.