Normal to have dust out of Hide-A-Hose outlet after installation?

My Hide-A-Hose system is 1.5 years old and I love it. However, whenever I pull the hose out of the outlet, dust bunnies come tumbling out of the opening. My contractor did the installation instead of the vacuum distributor (probably a mistake that I didn't find out about until later) and when I called the vacuum distributor a couple of months after installation to fix something, he was surprised to see the dust bunnies coming out of the outlets. Now, more than a year later, it's still happening. Is this typical and if not, does anyone know why this is happening?

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