Pics please none of us have crystal ball.

Sorry, thought it went thru....

The colors,shapes and sizes are random so there's no need to find a match.

I agree, looks like it's all going to fall over. Can you remove them and try another application of something else? Save those for a fire pit or planters, etc....

Do you live in a housing development where other houses have similar stacked stone? If so, you might want to check whether others are having this issue. With some investigation, you should be able to find the builder. Even after eight years, the builder could still have some responsibility here.

"Even after eight years, the builder could still have some responsibility here."

Why or how would that even be possible?

I would call it a happy accident because whoever installed it sure didn't have 'an eye' for stacking stone. Rip it off before it all decides to collapse and replace with something else.

You have dry stacked stone on the wall without mortar, this type of a stone (dry-laid) relies on gravity and expert installation because if this stone is not fitted properly in an interlocking pattern they will start to shift and become loose.

That being said contact a local contracting company specializing in dry stack stone installations and have them inspect that wall because the entire wall will fall apart.

Good luck

IMO those stones look terrible with the brick I would remove them all that was a poor install from the beginning.Put some nice siding there in a color that works with the brick