If I'm right, you cannot use the same plugin twice as a post-build action (note that I'm not sure). I ran into this problem when I was working as a Jenkins plugin developer for a company, and the solution was to use a plugin that does the same thing.
For example: for JUnit reports, there is the official JUnit plugin, as well as XUnit. For my problem it was easy.
So, maybe you can find a plug-in that does the same thing as Cobertura, or you can change the output format of java coverage or karma coverage. For example, for java you can use EclEmma or Jacoco ...
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