Agapanthus leaves turning yellow

I have a row of two different varieties of agapanthus, the one variety's leaves are turning yellow (Twister) while the other is still fully green (can't remember varity, but it is dwarf). Any ideas of what could be causing the yellowing, if it was lack of iron or bigs I would think it would affect both? We have had really wet weather andy soil tends to be more clay (I know they don't like to be overwatered),aube this is why? but again I wonder why one variety and not the other. if they turn yellow, will they come back? I sure love the and would hate to loose them so quickly. Yon can see both varities in the below pictures.

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