The only possibility remaining which could explain this behavior, is that your rollover dates for your instruments are off. This affects your installation, and is not something that will affect other's installations or Ninja itself.
If you are loading e.g. a month ahead of what NinjaTrader has listed as a rollover date, historical data will build up until real-time data is reached, causing a large difference in price data.
To attempt to resolve your query, please reset your instruments. You can do so by visiting Tools -> Database Management -> Update Instruments -> Check every box -> Update . You will want to close NinjaTrader and delete everything in your (My) Documents\NinjaTrader 8\db\cache folder after doing so.
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