I'm not sure why it does this, but Timewarp appears to be extremely glitched.
I was running a custom male elf two hander with Warfare and Scoundrel, and when I used Timewarp it would invariably glitch out and give me more than 1 extra turn and would eventually just make it so my abilities stopped having cooldowns. This is obviously an issue when using a skill like Adrenaline, as it gives you infinite action points. I actually dicked around with it just to see what happens if you beat Dallis near the end of the game. Fun stuff, but obviously not intended.
Also, for those who are curious, you can get 20 action points before it stops adding on new ones and just starts adding a "+1" and so on next to the dots.