You must make sure that the Custom Fields you want to appear are in the right screens that you want them to be appear, it's either in the Create/Edit/View screens (Issue Type Screen Scheme) or Transition Screens.
I'm not sure on what's happening on the Issue Type though, can you create a new Issue Type Scheme to be used by your project?
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Can you provide a screenshot of the Default Issue Type Scheme with the Task in strikethrough
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