I feel that somehow it reverted into maybe a plant in its lineage.
Generally reverting into a plant from its lineage is not possible.
Reverting a single characteristic to its "normal" condition from its more recent (mutant) condition is possible but is extremely rare. It can only happen piecemeal in plants such as daylilies. As an example, if the normal characteristic was red flowers then yellow flowers could be the mutant condition. A yellow-flowered daylily could, extremely rarely, produce one red flower mixed in with its normal yellow flowers. It could even more rarely produce a fan whose scapes had only red flowers in a clump with other fans that produced only yellow flowers. Over sufficient time, if the red-flowered fans were much faster growing than the yellow-flowered fans the clump might become all red-flowered. Only the flower colour would be different. The scape height, number of buds, flower size, flower shape, everything else about the red-flowered version would be the same as the yellow-flowered version. For this to happen would be extremely rare - maybe once in many million plants.
Visible sports (single new mutations) in daylilies are very rare. Again, if a visible sport appeared in a daylily cultivar in someone's garden it would affect one gene and typically (but not necessarily) only one characteristic.
Under certain conditions, an annual seed producing plant can revert to appear much like its ancestral form if it is allowed to set seed over several generations (years). That would involve natural pollinations between different forms of the plant and letting the seeds fall and germinate into new plants year after year.
For a perennial plant, such as daylilies which typically do not produce much seed naturally and in which any natural seedlings must compete with established mother plants it should take much longer for natural seedlings to replace named cultivars, if they manage to replace them at all.
I have a field of daylilies that is about 25 years old. I have hand pollinated many of the daylily flowers in that field nearly every year and sometimes I have not managed to collect all the seeds. Some of the seeds that were missed have germinated in the field. I have let those chance seedlings grow in place. None of those seedlings have managed to replace named cultivars in that time or even come anywhere near close to replacing any named cultivar.
