Harp shrine bug

I have use 120 ticket in harp shrine
I havé fight 12 group of monstre with one harp always
I havé try to capture all with 43% of chance
Finaly all echec 0 captur
Its not normal

The 4th harp is guaranteed, but the others aren’t. It’s a bad stroke of luck to fail so many captures, but it’s not due to a bug, trust me.