Thank you for your question, Chuck.  It is difficult to determine what is going on with your starts through photos alone.  There are 4 diseases that afflict them, some of which might have been present when you purchased them.  https://pnwhandbooks.org/plantdisease/host-and-disease-descriptions?title=rhubarb

At least as likely is that they were not planted correctly, or that the soil isn't appropriate.  I can't speculate with what I know.  Here is a comprehensive guide to growing rhubarb (commercially) that may help pinpoint the problem(s):  https://horticulture.oregonstate.edu/oregon-vegetables/rhubarb-0

Have you tested the soil for pH and nutrient content?  If not, here is a list of labs that can do that:  https://extension.oregonstate.edu/catalog/pub/em-8677-analytical-laboratories-serving-oregon

I hope this is a start.  Good luck!