At a guess, this may be a reaction to the disastrous demonetization that Narendra Modi (PM India) inflicted on that country a few weeks ago. The demonetization is now opposed by pretty much every other political party in India, and has resulted in the Congress party winning the state elections in Rajasthan (formerly a BJP stronghold), and probably many other states as well. Even some BJP stalwarts are talking of bailing on the party, as Modi’s cash fiasco looks like it will be the death of the BJP.
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The BJP has also won a few local body elections since demonetization, so one can’t read too much into it ... yet. Local body polls have a different dynamic and cadre-based parties like the BJP (and the Communists) have usually done better than parties that have no core ideology (like the Congress). As long as the Congress is in the sorry state it is in, the BJP will have little to worry about.