Short: If using teoz, and you have two activations on the same row, the first color is ignored and both get the same color.
To repro: Use code as this:
a->b: 1 activate b #red & b->c: 2 activate c #lightgreen
See this link to see full example:
http://www.plantuml.com/plantuml/uml/JO_1QiCm38RlUef_5CPsQA7hjaCEeQzYntyJWsCNHUdAddv95aZ05_twz5cw3kRKnZx9orrTspiOoozCHqeN0t4hnNnvYbYqHFYnhP3YZIbceYcfA0RNpvp2DHOVpcB9cDuIQ_d1swny5t77sbSuoueH7WTba5VuOzrK-DWw3GufjfsrIcR9nGYTQ-ceH1pWq9OI_ZlMEGEVz-HY7eGvO8wbETPXafvssh1gVHefOVdqSZglv6KY0xSLPe0LFhTnuZ34zA0AbuclFS_fZh1S-BsFmxxmScKEOv_-0000
BR! /marcus
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