MAMP site redirects to ssl protocol error

I’m trying to get a working local copy of an existing website to work in MAMP so that I can test for PHP 7 compatibility. I’ve got the site itself displaying, and I can navigate the site, but when I attempt to login at either https://localhost:8888/mysitefolder/wp-admin or https://localhost:8888/mysitefolder/wp-login.php I’m redirected to an ssl protocol error in Chrome, and in Safari I’m told it can’t open the page. For whatever reason when I attempt to load either of those URL’s the browser tries to change the http to https so it doesn’t work.

The live site has an SSL certificate that I manually upload through Let’s Encrypt, but I don’t want or need SSL on the local site. All URL’s in the database are reading https://localhost:8888, but I don’t know why the browser tries to redirect to https.

I’m using MAMP 4.2 if that helps. Any help with this issues would be greatly appreciated.