When you try to search by key level by typing e.g 8 (which should search through all dungeons level 7 to 9), it only shows Mists, Siege and NW at those levels, and the rest of the dungeons only at the specific level you search for (so, 8 in this case), but also it seems to be showing way less results for other dungeons. For example, when you try to search for Siege 8-8 it will show like 2-3 pages of dungeons, any other that’s not one of these 3 will show maybe 4-5 groups total.
When you try to find a dungeon in a level range (let’s say 6-9), it will not show anything other than Siege, Mists or NW at all. Searching for example, for “6-9 stonevault” will yield zero results always.