In chromatography why do some inks not move od the pencil line?

In chromatography, some inks do not move from the pencil line because they are less soluble in the solvent used or have a stronger affinity for the stationary phase (the paper). These inks may contain larger or more polar molecules that do not easily dissolve, preventing them from traveling with the solvent front. Additionally, if the ink is too strongly adsorbed to the paper, it will remain at the origin, resulting in no movement from the pencil line.