hey greyhares I think i just figured it out.. I also use rename wp-login on my site and i decided to test going to the usual default login urls to make sure they are all forwarding to the 404 or denying access which they were when i was done i checked the wordfence page not founds and it showed them all.. but also showed my IP with the same weird url with the -/-/-/-/-/-/-/-/ etc in it. SO i think it is just wordpress forwarding the user the the 404 page is when we see the url in question
try it out for yourself
thought id like confirmation for an expert :)