What trees and plants are they planted by?
Are they Iris or dayliilies or what?
They don't like to be planted by anything.
What are the giant shrubs or trees they are next to?
I don't think they like that spot.
Are they pretty new to that spot?
Did you mulch?
I think the competition for water is too great for them.
Move them to be more "on their own" and they will do better.

I don't know what the hedges are, but I really doubt it is lack of water causing the problem because there are drip lines for the Juniper plus it has rained several times over the last few weeks.

The groundcover was planted last fall and everything was fine with it until about a month ago.
There was no mulch other than whatever the landscaper used when planting it last year.

You say everything was fine until a month ago,
which is when the bulbs came up.
Right?
They are water hogs.
Move either one, you will be fine.