funny terminal behavior

[bigmauler]

OK I'm sure that this is a common problem and it's probably just a setting I'm forgetting.

But I have no idea what to do.
I'm using putty and I'm logged into my server at home.

I can't past text (for example an ebuild) into nano without the text
becoming tabbed more and more for each line down.

Instead of text look like this when I paste it in:

[tarpman]

Looks like it's doing auto-indenting. I don't use nano myself, but there should be a way to temporarily or permanently disable that.
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[Sadako]