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Numbers interpreted as dates

The plot works fine on codepen

But the exact same code produces the following output on my system.

As you can see plotly seems to think the numbers on x axis are dates. Not sure why this is happening.
My plotly version is 1.31.0

console.log(typeof(xdata[0])) produces number in the console.


Something was messed up in my layout. This works fine.
Please ignore.