Certified GKH Gardening Expert
It sounds like a lack of light. This can cause stems to elongate, becoming brittle, however your photo did not come through so I can't confirm this.
Sometimes, this can happen with overwatering, as well.
This article will help you to care for them properly: https://www.gardeningknowhow.com/houseplants/anthurium/anthurium-care.htm