[AS1] Flash Game losing tiles

[Roycommi]

Hi,

I am modifing a program I downloaded as experiment with doing a game and when I increase the speed it starts losing tiles.

example

When you scroll across white sauares start to show up and its seems to get lost. I cant figure out. I want the fighter to move by tiles and not scroll so upped the speed to 30 and it does this. Then I changed the speed back to 1 and changed the way it moves to multiples of 30, still does it. Am I miossing something in the program or is this a resources issue?

My fla to see my code

I would appreciate any assistance...

Roycommi