One of your falloff zones is not big enough to include those vertices that are being left behind.  My method of fixing such things goes like this.

1. Zero your figure

2. Select a bodypart and adjest each joint type one by one, resetting the figure as you go.

3. When you find the joint movement that leaves your vertices behind, select your glove and open the joint editor

4. Select the joint movement on the joint editor, then select the inner mat sphere.  On it's parameters increase the scale until the vertices pop back into place.

On the 4th part you can eitehr increase the scale all part, or one or more of the x,y,z scales depending on model.

Hope that helps.

John.

Fugazi (without the aid of a safety net)

https://www.facebook.com/Fugazi3D