It does look like the leaves have been burnt with something, Terri. The bugs are eating holes in the leaves, not causing the burnt edges. But soapy water does make the leaves more sun sensitive, if you don't rinse it off before the sun hits the leaves. That could be it.
Have you given the plants any fertilizer recently? Some plants don't like to be fertilized when the weather is really hot. Or the tips of the leaves can burn if the plant takes up too much fertilizer quickly (also related to the hot weather, plant takes in whatever's in the soil quickly).
If the plant is finished blooming and you're letting it make seed pods, it may just be going dormant on that stem, too. If you don't want the seed pods to ripen, you could just cut off that stem and see if the plant puts up new stems/flowers later in the summer.
