Were these planted last fall or in previous seasons? Other than species tulips, most others have a very poor record of perennializing or growing well and flowering for more than a single season.

Are they planted in the shade? All my Tulips bloom every year, only a few planted in the part of the bed which never receive direct sunlight don't.

Why is thought that the common cultivated ornamental Tulips tend to die off? These unnatural Tulips are much larger than "wild" types. Do the larger bulbs rot easier? Do they have trouble storing enough energy to keep blooming, so they fail? The bulb growers know how to reproduce these bulbs, but it is good for their business model :)

I dig up and throw out my hybrid tulips every year because I don’t have enough chill for them (I refrigerate before planting). But I notice when I dig them up that the bulbs have frequently split into several smaller bulbs - which wouldn’t be big enough to bloom.

My tulips always came back and bloomed fine until the bunnies ate them to the ground or ate the buds (no buds, no blooms). I guess we need to know what zone Lea is in to figure out if it's a zone issue or an environmental (sun/shade, water, nutrients) or planting issue.

Since they can be easily propagated, they can "perennialize", they just seem kinda dysfunctional and need some help. Maybe they have been selected, purposeful or not, to divide in a way that is productive for the tulip farms but this trait usually leads to failure in landscapes.