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You might also try right-clicking the cluster, and looking at Advanced/Show Hidden Element to see whether there might be controls in the cluster that are hidden. But ensegre's suggestion of copying across to a new cluster is probably easiest.

If you attach your .ctl, maybe someone could look into it. Anyway, have you tried to autosize to fit the cluster? My guess are that the extra controls are in there, just far out of your current border. Reorder controls in cluster might also give you some hint. Just open your typedef, create a new cluster (this will temporarily break the typedef), and drag into it the elements you want to keep. When you are done delete the original cluster and apply changes. That saves you from replacing every single instance of it in your codebase.

This is how I clear errors.

I've recently ran into this bug, and this workaround seems to make the trick, "most" of the times. LV2015.