In the post How to Extract data points from plot in mathematica to redraw it with another program?, I found out Tan @ x and Tan[x] are generating different data on export. What the context under which @ is used in Mathematica. For example, Catenate @, Tan @ x and Sort @ Select.
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Tan[x]is the same asTan@x, as well asx//Tan$\endgroup$Tan[x]is the same asTan@x, so presumably your have an order of operations problem. Try parentheses, or post simple code that illustrates the problem. $\endgroup$