Just an update. A 100pF cap over the resistor has indeed fixed the issue.
 

> Noise on the FB pin is a common problem with poor layout, hence asking for 
> a look at it.
>

I thought my layout would be ok. Maybe I'll remove the ground-plane keepout 
under the inductor next time as I'm using a shielded one to have less 
interruptions on the ground plane, and maybe I have to have a better 12V 
input to the IC. I thought my spacing and routing would be fine though, so 
I'm not sure.

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