Do you mean XP or Battle Points.

XP is what your cards get to level up.

BP is what you get to level your account.

Could this be due to using Eyrik or other cards that will give to minus points in the DT?

Pillz left over and life over 12 do give bonuses.

In daily torunaments the point rules are:

Points Table:
- Defeat: +5 points
- Draw: +10 points
- Rounds played (in which each player has bet at least one pillz): 1 = 1 point, 2 = 2 points, 3 = 4 points, 4 = 8 points.
- Rounds won: 1 = 2 points, 2 = 4 points, 3 =
9 points, 4 = 16 points.

Victory Bonus (only in the event of a win)
- Win: +15 points
- A win with at least one pillz left at the end of the fight: +2 points
- A win with at least 12 life points left: +2 points
- A win with fewer stars in your deck than your opponent’s: +1 point per star. Max 5 pts.

KO Bonus
- KO: +2 points


Timed out/Quit (considered as a win for the opposing player)
- The player who times out/quits: -20 points

Daily Tournaments: Characters with penalties


Some characters give a points penalty at the end of each match in Daily Tournament. You can see the list of these characters below:
Group A ( - 10 points ):

GraksmxxT , DJ Korr Cr , Kiki Cr , General Cr ,Lyse Teria Cr , Vickie Cr , Ambre , Hugo , Jackie Cr , Marco Cr , Alec Cr ,Lamar Cr , Smokey Cr , Tanaereva Cr , Guru Cr , Caelus Cr , Eyrik ,Eklore , Morphun

Group B ( - 5 points ):
Kolos , Copper , Striker , Rolph , Emeth ,Oshitsune , Kerry , Shann , Gil , Ghumbo ,Marina , Naginata , Spyke , Slyde , Eddie ,Bonnie Ld , Sigma

Group C ( - 2 points ):
Rowdy , Sledg , Lou , Zatman , Ulrich , Ratanah, Hawk , Wee Lee , Toro , Yayoi , Shakra , Askai ,Dorian , Cliff

Thats ok, its what im here for.