That looks pretty normal to me for late summer.

I let the liriope go until sometime in late winter when I cut off the old, ragged growth before the new growth of spring. You can run it over with a mower or use shears to cut off the old growth - either seems to work.

Oh good to know. The other haven't turned yet so I didn't know what to think

It takes time to develop a good root system.

Even though plants have the same name (are the same kind), they are individuals.