Hi I have a question/problem with alliums

I bought and planted about 20 Allium schubertii approx 8 years ago. Every year they have come back without fail. In the same bed and scattered around my yard are L. Black Beauty, L. Casa Blanca, an old Martagon, some

tigers that I hybridized myself, and little spring bulbs like daffodils, fritillaries, chionodoxa, hyacinths. They all came up so I have to think it was not an animal feeding on an allium if it passed up the tastier stuff. This year - no A. schubertii, in the main

bed where there were 10 or more, nor in other beds around the yard. I think 1 came up and it looked really weak

and had just a small bloom. I had some A. Everest that came up and barely bloomed, and a few unknown purple ones that are smaller than Globemaster - they all looked weak and small.

What would hit just alliums and not other things? I will say that this year the bulbs have all born smaller flowers and are shorter - last winter there was no snow cover and its been super hot and dry this summer.

Thanks for any thoughts on how to save what I have