Most probably you started a structural column but trying to load an architectural column family (or vise versa)
There are two folders for posts/columns. One is simply called Columns and the other is called Structural Columns … make sure you are loading from the right one
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When you go to architectural tab > Columns and click the drop down arrow, you should have both options Structural and Architectural
see this YouTube for more info https://youtu.be/DpOsdyqzKE0?si=tw0_Dsdcq_iryX7C
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I don't think an architectural column is appropriate here. Turn on Structural Columns category and place a structural column:
When adding a structural column in a floor plan, play attention to the option bar and you want to change from Depth to Height.