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These will drink water like crazy. It is likely that they are just using all of the water. The soil could be too compact, not letting water through, or too light and not holding enough water for long enough.

This article will give you more information on the care of morning glories: https://www.gardeningknowhow.com/ornamental/vines/morning-glory/growing-morning-glories.htm

Morning glories bloom best in full sun. Many gardeners have written in this summer because, in part, the excessive heat is causing plants to fail to bloom. This is a coping strategy as blooming places stress on the plant when it is already stressed by over-heating. Make sure it is well-watered and the soil has 3-4 inches of mulch to help keep the roots cool. Keeping roots cool is a big challenge when growing in containers in full sun. If you have lots of healthy green leaves and no flowers then the problem might be your soil is too rich. Morning glories bloom well in poor to average soil. Rich soil or addition of fertilizer will favor leafy growth over blooms.

Morning glories put out a terrific amount of seed so if you've had them for more than a year, you'll have a near continuous eruption of new plants for several years to come. Seeds aren't affected by herbicide. You might try a pre-emergent which keeps many seeds from germinating. On a metal fence, they can be hit with a small weeding torch. Other than that, your best friend is a hoe or hand-held weeder.

For future reference, don't pinch back plants before they are 3-4 inches tall and has several sets of true leaves. What you've done is set back the emergence of true leaves which the seedling desperately needs for photosynthesis/energy. Does the seed have enough energy to overcome your rookie mistake? Only time will tell. This article discusses pinching and pruning of morning glories. https://www.gardeningknowhow.com/ornamental/vines/morning-glory/prune-morning-glory-plants.htm

It may have been best to wait until they were dormant to divide the plants.

Morning Glories can be very hardy, so they likely will recover with some time. Avoid over soggy soil.

https://www.gardeningknowhow.com/ornamental/vines/morning-glory/growing-morning-glories.htm

Morning glories are highly invasive, and require little to no fertilization. Flush the soil out with lots of water. These wonderful flowers will bloom when they are ready, and are somewhat frost tolerant. Here is an article that will help: https://www.gardeningknowhow.com/ornamental/vines/morning-glory/morning-glory-not-blooming.htm