No wall, anywhere, in any game, has thickness. Everything is made up of infinitely thin triangles. Those triangles are used for displaying textures/lighting, and in our game, are also used to detect collision with the player. The triangle has collision, and you have collision, there is no reason you should be able to move past the triangle.
However, as Bob speculated (though backwards), if you get lag at the right time, your client thinks you have moved a certain distance, and the server lost track, so it checks with the client, they hash it out. Often, it's safer to reset you to the position you were in before the lag (i.e. rubberbanding) but sometimes it will put you to where it thinks you were going.
There are a few things we could do about this, if it were a major problem. The easiest would be to position warp volumes all over the areas outside of the walls. So if you happen to make it out of the wall, when your client and the server sync up again, you will be within a volume that will then teleport you back to a spawn point.
So thats why I can't fly higher than a few meters with my jetpack on SFA?
Don't look silly... Don't call it the "Z-Store/Zen Store"...
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So thats why I can't fly higher than a few meters with my jetpack on SFA?
Your Javelin deals 125417 (89066) Disruptor Damage(Critical) to Tholian Recluse. > lol