Well the tiles pages that im adding are pretty large, but there only using the first two rows off.
If only a few of the picture's tiles are displayed in the editor, then you've probably added a tile picture intended for the B to Eslots into one of the A slots.
The A-slots are for autotiles only, and they need a different format than the other tiles, resulting in only some of the tiles of the tilepicture being displayed.
The not displayed A-Tiles are then used for internal reconfiguration of the autotile.
Usually some of the tile pictures for VX Ace in the resource packs should include a label like A1 or A3 in their filenames. If such a label is included, that picture can only be used in that slot of the tileset. If no such label is included, the picture is intended for use in one of the B to E slots and cannot be used in an A-slot.
(always assuming the picture filenames follow that convention)