Adding Custom Tiles Problem

I am on edge of quiting my project because of stupid tiles. Actaully, the tiles are not the problem, I have a lot of custom tiles and I couldn't wait to get them into my game. I was so excited I came up with an idea to remove all of the origianl timesets and change tilessets for every stage, room, dungeon I make. well as soon as I did and added my tilesets I went mad. I don't know what the problem is, but when I for example take a tree tileset and add it in Outside_B it cuts some of the tiles in half and the others are good. I was a little mad with this, but it just got worse from there. When my whole Outside_A was empty, I just added Tile A as floor and other A's were blank and it was totally messed up, like only 5 out of 30 tiles were shown. Is it becuase of the other blank A1,A2,A3 and A4 spaces or what? Please help, so I can continue my project.

Could you possibly show some screenshots for a visual of what's happening?

Can I see some screenshots please?

In this screenshot I captured the problem where Tileset A5 is good, but Tileset A2 is messed up and missing a lot of the tiles, as you can see. Is it perhaps the problem in the name? Maybe they aren't tile sets A5 and A2 and how can I figure that out? Also what goes into B,C,D and E?

I'm not seeing a problem? Those are all the tiles, they're just compressed to fit into the tile sheet. If you try to use them on a map they should all look right.

Believe it or not I looked at it now and just figured that out, haha! Another problem I have is when my tiles are splited in half when I add them to B, leaving one half of the tiles on the begging and the other half on the end, but I can live with it. Now that I tried everything seems to work fine, when I tried it before it was more messed up, sorry for false alaram. I will post again if I have problems. I just thought the whole tileset should be show, but I guess the bigger squares of field tiles (4 tiles like one) are not needed it game. Thanks!

Edit: Here's my question with what has been bothering me. When I have a table in A5 and I try to put a tile on top from the tileset B, it just replaces it, rather than going on top of it. How do I change that?

If you go into the Help file in the maker, you can search Resource Standards and read all about the specifics of the tilesets. 

I believe tables have to be in A1 or A2, can't remember which.  Reading through the Resource Standards in the help file will really help you get a grasp as to what is going on and how to properly set up custom tilesets.

Also, you don't have to remove the original sets to create your own.  In the database, at the bottom below where it lists all the tilesets, you can "change maximum" and just add additional sets in.  It will save you some time.

All my tiles have their appropriate names attached to it (see the original thread). TileA1 goes in TileA1 etc. etc. don't mess them up.

I know this is kinda late replying, but I started working on my new project and remembered I had problems with tiles in the past, so I will ask one question before I start working again.
I get that your custom tiles have appropriate names on them, but if I want to use your TileA1, does that mean I have to delete the existing TileA1 that was already in the game or can I somehow add your tiles and still keep the tiles that were already in the game?

Each map can have its own tile set.  

Keep the tilesets you already have.  Increase the maximum number of tilesets in the data base

Add your custom tiles and create your own sets, each with a clear name.  Mix and match to your heart's content.

To ksjp17: Lol that post is awesome, they should've hired you to write the fast descriptions of RPG Maker VX Ace's  features.