It might just be a browser update that's causing your browser to warn you about a security issue that's always been there - but isn't really a security issue for this site. Trapperman doesn't automatically force you to the secure version of the website (https) if you go to the unsecure version (http). That's important if it's a site where you're sending your credit card across the web because that traffic isn't encrypted and all of the internet equipment between you and the website could see your credit card info. That's not really a security problem for Trapperman.
To see if that's the problem, try both of these links in a new tab:
Not Secure Version of TrappermanSecure Version of TrappermanIf one gives the warning and the other does not, it's just that you're viewing the non-encrypted version of the site. To get rid of the notice, change the "http" to "https" in the website address at the top of your browser.