@palmercr is correct; the Air Filter is automatically included at checkout, but can be removed. Since you unchecked it, your total was reduced and you purchased only the Glowforge Pro without an Air Filter. If you’d like to add an Air Filter to your order, they are on backorder until September 2018. Normally we wouldn’t be able to add to your purchase after delivery, but if you’d like, in this case we can make an exception - email support and we can invoice you for the air filter.
I do apologize for the wording that caused the misunderstanding; thank you for letting us know. I’ll have someone look at it as soon as possible.