[Why did I get all zaw strikes lvl30 but i only got 3000 mastery points but not 24000?]

Hey guys I wonder whether each strike part of zaw will give us 3000 mastery points ?

I've got my first zaw since the first plains update and at that time we could only see "zaw". And i've heard that each strike would give us a 3000 mastery points so i began to forge a new zaw, lvl up to 30, donated it and forge another one.

Some updates later the game add all "Zaws" so we could see which strike we hadn't farmed, but I saw that all the strikes that i've donated has... gone ! It seemed that i've never touched them !

What's more, after I reforged every blade and got them lvl30 again, I found that my mastery exp stayed the same !! Nothing changed !!!

So actually, only one zaw that could count 3000 for mastery points ?