here's the yellow one. they looked fine in pots, in the ground they are dying, what caused this?

I’d suspect your problem is the gravel top dressing that is heating up your Sedum too much.

Here's an update. 3 out of 5 S.hispanicum 'Aureum' melted away, these have rooted in and are taking hold, My only question what happened to the gold color, will it come back?

below is S. dasyphyllum 'minor' AKA Love & Tangles which seems to be doing better, I really wanted something well-behaved here and not aggressive Source is Peppers Greenhouses Milton, Delaware.

Here's my S. hispanicum 'Aureum' today, living and seems OK but more green than gold.

Here's my S dasyphyllum 'Minor' full of white flowers and filling in nicely. I am new to sedums, I want to keep the plants tidy, should the spent flowers be removed? What is recommended?