When you move a bone and wrong vertex groups are moving

Hi, I am a beginner. I am trying to create a Lara Croft (I used makehuman in support) and now it’s rigging time.
I used “with authomatic weights” on many merged objects with CTRL+J. So I had a single mesh before do it.
Weights are almost regular: https://i.imgur.com/YF1ClSL.jpg
Vertex groups too: https://i.imgur.com/uzxecem.jpg
But something weird happens: https://i.imgur.com/mD1W2eF.jpg

So, why? And how to fix it?
I want to remove manually a vertex group from a bone, I think. But how?

aaaaa well there are several different ways to fix the problem…

You say your a newbee but you know enough to have used what? the MetaRigg? right?
and Parented with Automatic weights correct?

and you seem to know how to open up the weight paint window…

note that if you place your Armature in pose mode before you place your Mesh in weight paint mode…
you should be able to just select a bone and see all the places on the mesh it has influence over without blender kicking you out of weight paint mode…

that should help you weight paint that stuff back into place…

but also… know that there is such a thing as weight assignment…

i’m assuming you know where the properties panel is…
if not check this out…
https://www.blender.org/manual/editors/properties_editor.html

also if your a newbee to Rigging then I highly highly highly… lets see did I say highly recommend you watch this video…

this video was done by Nathan Vegdahl one of the truly great Blender Rigging and Animation Gurus…
you won’t be disappointed you watched this video …

I recommend you watch this video alll the way through before you start applying any of the concepts to your Rigging problem…

Thank you very much, but after days I’ve found the problem. It was simply a crazy weight paint where the point of the second finger was, in some ways… related to belt and pistols. Anyway thanks for the video. I am not really able in english but I try.

Anyway thanks for the video. I am not really able in english but I try.

hummmm… I will hunt around… I’m not so sure that Nathan hasn’t had someone do some translations of a few of these…