So disappointing! Here are some suggestions:
At first glance, it looks like you are not utilizing the "rule of halves". Scores break better with equal tension to the right and left of the score. When it's possible, choose the center score and break that one first. Then the center score of each remaining piece.
Also, are you using plenty of oil?
What kind of breaking pliers are you using? Do they have fresh pads on them?
Consider firing a flat tile of the same dimensions entirely out of clear glass and practice on that.
12 Ways to Improve Your Glass Cuttinghttp://www.bullseyeglass.com/methods-id ... tting.html
Glass Cutting (free video)https://videos.bullseyeglass.com/videos/glass-cutting/
I hope this helps!