Hi Ko Naw San Aung, Thanks for actively contributed in myOSM community. 
Here I wanna discuss about the highway = track that you mapped and it looks like it has been redrawn on the existing highway = unclassified road segment. If the road segment was already exists, you don't need to map it again and you can change the value from Tag like highway = unclassified to highway = track. Another way is if you want to map a connection with other roads, you can continue to map it with the existing road segment. 