You have a heavy black mark to the left and a smaller black mark to the right of the score line. A tell-tale sign of where you brought the breaker down.
That could be your issue. After the score has been made, the break has to start from the end of the tile to split straight down the line. You can gently press the breaker down at various point along the score to weaken the tile, but the final break needs to be done from the very edge of the tile otherwise the split has nowhere to start. Breaking further from the edge, can lead to splitting in all sorts of directions which is what your issue looks like.
The tiles don't look as if they are anything out of the ordinary, but the second break lower down could be down to over or under scoring, or may be a knock on effect from the initial stress of dropping the breaker in the wrong place.
One other downside of the rubi breakers on the TR and the TX, is that its painted metal pressing on the tile. Thats probably why it left the black mark. We'd had this issue before on the TX cutter and we stuck a thin layer of rubber on the bottom of the breaker arms. No more black marks and the glaze is protected against excess pressure.
If the black mark isn't from where you dropped the breaker, then I haven't got a scooby, other than the over or under scoring or the tile being mis-aligned from the centre of the cutter.
