​How do you deal with a know it all employee?

In my specific case- this employee is not an obnoxious know-it-all. They just always seem to “already know” about the new things I am sharing with them. This employee is a great salesperson at my small retail business and knowledgeable about specific product areas. When I bring up new items we’re going to bring in or new information regarding that product they never receive the information as new (ex: “ok” or “that sounds good”) nor do they ask more questions. They always respond in a way that signals they already knew everything.

For example- I brought in a new product a few weeks ago. It sold well so I brought more in and a similar product from the same producer. I was telling this employee about the new product and why I was excited we were able to get it. Instead of receiving this new info or asking questions- they responded by saying that they already knew about the product and they had recommended it weeks ago. This was a brand new product that launched recently so it could not have been something that was recommended weeks ago. We also have a single place to record employee recommendations and it was never on this list (I check this list several times a week). And it was obvious the employee didn’t know about the new product because they kept mispronouncing things and repeating things about the older product.

I didn’t say anything and often don’t say anything in these scenarios because it seems like it’s coming from a place of insecurity (I am the owner and this employee is older than me) but I’ve noticed it happening more often as we slowly expand. This employee also misremembers things (former processes, products we had, things we did/did not do, etc) and brings up alternative versions of the past. Sometimes I pushback on these alternative versions because it’s important to the business but I don’t want to constantly have to factcheck their version of events. This coupled with their general “oh yeah I already knew that” attitude is getting frustrating. any advice on how to deal with someone like this?

EDIT: I also wanted to add that we very fortunately have a good team relationship and I try to lead by example when it comes to learning new things. I often admit openly and enthusiastically that I don’t know something and am excited to learn more about it. (“Oh wow. I didn’t know that!”) This is because I know I don’t know everything and am genuinely excited to learn more about my industry. For example- I learn from customers all the time.