Depending on how much water you give your flowering African Violet each time, you are probably overwatering it. A thorough weekly watering should be adequate.
It looks like your Philodendron is growing in water and has been for a long time. The plant's water does not provide enough nutrients so after a while the leaves do what yours are doing. You might consider moving it into a small pot with soil or adding some hydroponic nutrients to the water.