

This is not an error, the current source is per spice convention. (https://www.seas.upenn.edu/~jan/spice/spice.overview.html, refer section 2.1.a) .
The current source can be modeled as DC, AC, Pulse and so on.
The arrow merely represents that it is a current source, it does not indicate the direction of the current, flow of current depends upon how the nodes are specified.
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