Percentages published from one global model are vanishing when another global model is published.

In a Workforce compensation plan, we have 4 components defined, off them we are using 3 of them in Global Model publishing, 2 of the global models with old components are working fine since few years, this year we added a new component with Global model. When we publishing the new Global Model (i mean with the new component), its working fine, but, if we are publishing the Global Model with old component, the percentages published from the Global Model with new component are vanishing. If we republish this, its working fine. Could any one help me understand why this is happening?