Why does the price of index ETFs spike so much since 2020?

what are these 20% spikes?

i see that they’ve happened quite frequently only since march 2020


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Someone had asked a similar query on Twitter. A person mentioned that this problem might be happening due to a trade type called ‘xseq’ in NSE -


I had my own question, what does XSEQ trade type mean in NSE? @Siva