Erroneous historical data

sayali_ghosh1984
I downloaded historical data since 2015 (minute), for India Vix. It returned erroneous data from 10-Dec-2018 to 02-Jan-2019. Please see screenshot attached. Leaves me doubtful over reliability of data, I encountered this fault while doing basic manual checking, which cannot be done everytime data is pulled.

Can someone please help me understand? (PS - data was downloaded from 1.1.2015 9:15AM to today, rest of the data looks ok, only this was exception)
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