[Got some strange bug? Or not.]

Played half a year ago and got this, but thought it fine. Had no mods then. Now got 1 mod for russian localization. And still got this strange thing. All the rest game is working perfect. 

[Got some strange bug? Or not.]

   Hello! I have some strange bug or maybe not. Screenshot below. All islands like that. Just covered with water and no visible island landscape. Is something wrong or am I just slowpoke?

   Maybe just some setting or option  missed.

Game is great and I will keep playing anyway. It's just feels wrong for me,when it looks like this.

If needed, I can make screenshots of settings or anything you need.

Sorry, if it's common question and I missed it somethere.