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If you install unsigned content the resulting dialog shows an error instead of a warning. Relevant code is located in package org.eclipse.equinox.internal.p2.ui ValidationDialogServiceUI
Can you please attach a screenshot of the exact dialog (with expanded details, if available)? I see that warning since years, and for me it has always been with a warning image. Looking at the code, an error image should only appear if the IStatus given to the dialog is either null or has severity error. I currently don't see where that IStatus object would come from in the class you mentioned.
This has always worked for me as well. Perhaps there are only errors if the signature is invalid? In any case, without something that replicates the problem there's no fixing it.