What's your question? Ask

Direct sow your seeds outside in early spring. Prepare the area by raking loose the top few inches of soil, plant the seeds and cover lightly (only about 1/8 in. deep). Keep the soil moist after planting until the seeds germinate in 14 - 28 days, depending on the temperature. Here is more information on growing poppies: https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-poppy-flowers.htm

We did not receive the image.

https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-poppy-flowers.htm

Poppies can be susceptible to Downey Mildew, Grey Mold, Powdery Mildew, Tomato Wilt Virus, and Rhizoctonia Root Rot.
Without seeing the plants or leaves, and the time of year, I would suspect a fungus disease of some type.
Clean up and dispose of any dead leaves to prevent spread of disease.
Avoid water splashing onto the leaves with overhead watering and apply a fungicide to the remaining plants on a cool, overcast day.

This could be a fungus or even watering issues that cause the stems to fail.
Damage caused by people or pets could also cause the stems to fail.
Look for any other signs of disease on the leaves.

The link below will help you determine if it's a fungus issue.

Avoid over head watering.
https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-poppy-flowers.htm
http://www.ipm.ucdavis.edu/PMG/GARDEN/FLOWERS/DISEASE/virus.html

Your Poppies may need to be divided.

You can divide your plants in August when they are dormant.

https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-oriental-poppies.htm
https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-poppy-flowers.htm

https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-iceland-poppies.htm
https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-california-poppy.htm

I have a friend who trims them back right after they are done blooming. She also digs them up at that time and will move them or pass them on to a friend as her bed is full and crowded. This does not seem to effect the blooming the following year in any negative manner.
Some suggest that waiting for the leaves to die off naturally is a better way.

Poppies do not do well being transplanted, so it's best to avoid it if possible.
You need to make sure you dig up all the roots and plant is the same sun location.
Don't divide or even shake off the soil from the freshly dug up plant.
Continuous care is needed to get your Poppy going in it's new home. Fertilize it every 7 to 10 days with an all purpose fertilizer until you see new growth.
Root rot is often a problem, so water the newly transplanted Poppy well, but make sure the soil is draining.