Lead conversion: Opportunity name missing

I'm currently working on lead conversion. For some reason on a specific instance I have an issue after adding opportunities into the conversion modules. In the convert-results view I can see the Account, Contact and opportuntiy module. For some unclear reason the opportunity is missing the name / link of the opportunity? When I hit the preview button the preview is loaded correclty. 

I did some debugging and noticed that before rendering the html the associatedmodules collection does contain all the modules but the name attribute of Opportunities is 'null'. Anyone know what would cause this behaviour?

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