question

Data imported from excel is only interpreted as either a number or a string. Either change the respective column back manually.

Or toggle the cells as FlexScript with the following code (for example as part of the 'Post Import Code').

Table table = Table("tableName");
int scriptColumn = 1;

// Toggle cells in 'scriptColumn' as FlexScript
for(int row = 1; row <= table.numRows; row++)
{
    treenode cell = table.cell(row, scriptColumn);
    switch_flexscript(cell, 1);
    buildnodeflexscript(cell);
}