Likely there are issues with your data, high possibility that some quotes are missing. Go to Mthly-Symbol worksheet, select "*Original*" currency and make sure that Account or Year slicers have no filters. Then start select symbol by symbol and make sure that monthly results make sense for each symbol. Pay attention to Qty Bought/Held and Total value fields - do they make sense? Are there any months when Qty Held disappeared? If so, that would mean that you have no quotes for these months.
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Go to Mthly-Symbol worksheet, select "*Original*" currency and make sure that Account or Year slicers have no filters.
Then start select symbol by symbol and make sure that monthly results make sense for each symbol. Pay attention to Qty Bought/Held and Total value fields - do they make sense? Are there any months when Qty Held disappeared? If so, that would mean that you have no quotes for these months.