Why don't the lists of David's sons match?

The Bible gives the sons born in Jerusalem three times, and the lists differ. 2 Samuel names eleven: "Shammua, Shobab, Nathan, Solomon" (2 Samuel 5:14), "Ibhar, Elishua, Nepheg, Japhia" (2 Samuel 5:15), "Elishama, Eliada, and Eliphelet" (2 Samuel 5:16). This chapter names thirteen: "Shammua, Shobab, Nathan, Solomon" (14:4), "Ibhar, Elishua, Elpelet" (14:5), "Nogah, Nepheg, Japhia" (14:6), "Elishama, Beeliada, and Eliphelet" (14:7). 1 Chronicles 3 also has thirteen, counted "four" (3:5) and "nine" (3:8): "Shimea, Shobab, Nathan, and Solomon" (3:5), "and Ibhar, Elishama, Eliphelet" (3:6), "Nogah, Nepheg, Japhia" (3:7), "Elishama, Eliada, and Eliphelet, nine" (3:8). Where 2 Samuel and 14:4 have Shammua, 3:5 has Shimea. Where 14:5 has Elishua, as 2 Samuel 5:15 does, 3:6 has Elishama. Where 14:5 has Elpelet, 3:6 has Eliphelet. Where 14:7 has Beeliada, 3:8 and 2 Samuel 5:16 have Eliada. Nogah is in both of Chronicles' lists (3:7, 14:6) and not in 2 Samuel's, and neither is the name at the seventh place (Elpelet in 14:5, Eliphelet in 3:6): 2 Samuel goes from Elishua straight to Nepheg (2 Samuel 5:15). Those two places are the difference between eleven and thirteen. None of the three says why, and this answer doesn't explain it.