Hey @Koorius_G,
Most of the Insights sheet data is independent of the Balance History or Accounts sheets. The Account information only matters in the top-3 balances section or if you are using the Account filter in the Transaction Analyzer.
Are you using a custom date range in the Transaction Analyzer to query the 2018 data?
How did you move over the data? Manual copy/paste or via the Tiller Labs importer?
Randy