Name: Anne Summerville, SC (Zone 8a) Only dead fish go with the flow!
Hi Amalsaro and welcome to NGA!
I'm no expert with Anthuriums but I'll take a guess. Since they are originally from South America it could be that the temperature is not warm enough. In my experience they prefer temperatures between 70° F and 90° F.. I've noticed something similar with my Anthurium during the winter when they are in a greenhouse which is kept around 60° F they seem to become more compact
Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Douglas Adams
