You're using the sponge dry. We get it, you didn't read the instructions, but the Beautyblender is supposed to be used wet. The damp surface gives you streak-free blending and a dewy finish.
Your sponge is dehydrated. Professional makeup artists like to keep a cup of water nearby to keep the sponges moist while working on set. "The best way to use the Beautyblender is when it is activated and damp and completely wet," Rea Ann says. This January, the brand is releasing a new Reactivate spray that will plump the sponge when water is scarce.