Put the summary of the bug you're having here

*What I expected to happen was...:the minecart will just go round and round
Describe what you thought should happen here

*What actually happened was...:the minecart with tnt exploded
Describe what happened here

Steps to Reproduce:
1. make a 3x3 circle using powered tracks with rail at the corners
2. power the powered rail using redstone torch
3. put the Minecart with TNT and push it, it will go round and round
4. put another minecart and wait
5. the minecart with tnt will explode