In what appears to be a gradebook calculation anomaly, be sure items are categorized appropriately even if you course is only using categories for organization – otherwise final course grade calculations may be inaccurate – as the following video explains.
To address categorization of an item, check the Gradebook>Settings>Categories and Weighting to insure you’ve setup the gradebook correctly (specific to each course). Next insure all items which have bearing on the overall grade are INCLUDED in the course grade calculation – making sure they DO NOT have a calculator with a slash through it AND that they are not in an uncategorized category:
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