Wrong Url with 5 or more slide

Good morning,
i’m facing a strange error. Actually i made a Slide of 8 image,each one with his url associated. The 6th slide doesn’t link to the proper page, instead it link to the previous one. I’ve try to move the slide or change the url, but the problem remain. The problem come when you place 5 or more slide, the last link or the middle one isn’t working; always link to the previous url even if a change it. I’m using WP 4.3, the problem come on every browse ( Firefox, Chrome, Opera, IE, Safari ). Can you check or give me some advice about it.
Thanks

https://wordpress.org/plugins/master-slider/