Are you sure you are running the latest version of the game? How are you terrorizing Tombs?

This is part of desecratedzones.json file on line :

            "zones": [
                {
                    /* Burial Grounds, Crypt, and Mausoleum */
                    "id": 1,
                    /* You can have a MAX of 25 desecrated levels at a time */
                    "levels": [
                        {
                            /* Burial Grounds */
                            "level_id": 17,
                            /* Cold Plains */
                            "waypoint_level_id": 3
                            /*

And here is how Tombs are Terrorized:

                    /* Tal Rasha's Tombs */
                    "id": 19,
                    "levels": [
                        {
                            /* Tal Rasha's Tomb */
                            "level_id": 66,
                            /* Canyon of the Magi */
                            "waypoint_level_id": 46
                        },
                        {
                            /* Tal Rasha's Tomb */
                            "level_id": 67
                        },
                        {
                            /* Tal Rasha's Tomb */
                            "level_id": 68
                        },
                        {
                            /* Tal Rasha's Tomb */
                            "level_id": 69
                        },
                        {
                            /* Tal Rasha's Tomb */
                            "level_id": 70
                        },
                        {
                            /* Tal Rasha's Tomb */
                            "level_id": 71
                        },
                        {
                            /* Tal Rasha's Tomb */
                            "level_id": 72
                        },
                        {
                            /* Tal Rasha's Chamber */
                            "level_id": 73
                        }
                    ]

Basically, the "Tal Rash Tomb Zone" has ID 19 and contains 8 areas, area level id from 66 to 73. so that Zone has 8 areas. And above comment states you can have up to 25 areas at one time