In the current version of Graph Maker there is a bug that I called, hoping that my english translation is not too bad:
XPresso asynchrony in frame updating with Bend keyframed animation
This means that when you make an animation with the Bend option keyframed you probably have some frames in which XPresso did not complete the calculations of the scene. This problem concern the Number Values and the Labels. You can see that in the following video at second 04:
If you can not see it in the video, surely you can see it in the frame extracted:
Now you can see the bug fixed in this new video:







