Currently, they are showing the incident with Sahastrarjun.....Earlier, they showed that Ram was born, and was already a teenager.........
In reality, Sahastrarjun died LONG BEFORE ram even existed. After killing Sahastrarjun, Parshuram made the earth kshatriya-less 21 times.......even during this time, Ram wasn't born yet.......
Also, Sahastrarjun's death occurred long before the Dev-Asur sangram in which Dasarath fought. Like.......LONG BEFORE..........By the Dev-asur sangram, Ravan's son, Meghnad, was already sixteen.....however, at the time parshuram defeated sahastrarjun, meghnad was nonexistent.......
This is sort of like the show Om Namah Shivay.......in which the facts are shown in any random order.....actually, this show is even more extreme than Om Namah Shivay.....