Guild Wars 2

I’ve noticed that when I mine iron ores underwater, even if the resource node contains 4 ores, my character stops at 3. Many times, I’d mine, and when my character stops, move away only to discover the node still contains one more ore.

It also happened once with Gold ores too.

It happens everywhere not only underwater. Also rich veins have 10 ores but it still stops at 3 so u have to do the process 4 times.

You do know that WvW can give gathering bonuses, that allow you extra gathers at nodes? http://wiki.guildwars2.com/wiki/Power_of_the_Mists

In general, you only get one “go” at the node, which can give 3-4 of the item. If that WvW bonus procs, you get an extra go at the node.

You can also leave the node before you’ve actually finished it – and then go back to get the rest of what you would have had if you’d stayed there for the full gather. Lag may cause you to think it’s done and leave early.

Rich nodes give 4 goes at the node, for 3-4 items each go. Again, gathering bonus can trigger an extra go at those too.