Help Double trailing slashes in SERP

hello I have a problem about this URL.

I change my URL default post URL to a custom permalink using this plugin https://www.ads-software.com/plugins/custom-permalinks/

Now in this plugin I want my URL to be like this https://www.webhostingdecisions.com/coupon/bluehost/

but when I look at yoast Snippet preview my slug URL is showing double trailing slashes
“https://www.webhostingdecisions.com/coupon/bluehost//”

But If I make my Custom permalink https://www.webhostingdecisions.com/coupon/bluehost without extra “/” slash the snippet will not show the extra slash
But what I want is that my permalink will look exactly “https://www.webhostingdecisions.com/coupon/bluehost/” using custom permalinks plugin

How can I remove that extra slash?