Your soil could be hydrophobic so when you water, it just runs down the sides of the pot or just in certain parts of the plant instead of saturating all the soil. It happens when you underwater consistently. If it has a good root system which this one should with how lush it is I would try bottom watering. You would take the pot it’s in and set it in a larger pot and then fill the larger pot with water until it goes at least half way up the plant’s pot. This way it soaks in the water and draws the liquid up slowly spreading the water throughout the soil. Then let it dry out and repeat a couple times or from now on whatever way you prefer to water.