Weight paint wont paint over other vertex groups already painted

I’m not sure what’s going on but weight painting is messed up for me al of a sudden.

In bone weight paint I cant paint over vertex groups that already have weights from other bones on it.
Also in texture weight paint I have 3 vertex groups. the 3rd one wont paint at all. I think the issue is related.

Is there some setting I have enabled or something I can check for?

Any suggestion is super helpful, I’m on a deadline and have never encountered this issue before.
Let me know if you want to help and need more info.

Thank you,
Rino M

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Yeah so I found the issue, in the Tools menu, somehow the Restrict Option was enabled