Solved! Reading another post i set the twist angle to zero to uncouple flap and edge modes. I also change some parameters to my model and results match.
Mode Bmodes Calc err %
1 0.67639 0.67289 0.52%
2 1.08970 1.08429 0.50%
3 1.94890 1.95460 -0.29%
4 4.04300 4.00517 0.94%
5 4.51440 4.54865 -0.76%
6 8.10160 8.22479 -1.52%
7 9.3866 9.35616 0.32%
8 12.747 12.50460 1.90%
9 17.157 16.88141 1.61%
10 18.54 18.22292 1.71%