The 12ngg does not show in my coinbase wallet history...I don't understand this? Only the 36ii5 address does...
This does make sense.
From the coinbase FAQ:
Coinbase began implementing SegWit across our platform on Wednesday, February 21, 2018. We will progressively update all customer Bitcoin addresses to be SegWit-compatible (SegWit addresses) over the following week.
So, the 12ngg.. is somehow a different address (not from coinbase).
Did you use any software wallet on your PC / mobile ?
I did everything on my iphone...I have the coinbase app where I generated the wallet address...after I copied it I then went to Kraken on safari and pasted into the withdrawal form.
What is confusing is how did the first transaction make it into coinbase? On Kraken each withdrawal shows that I sent to the same wallet adress..that being the 12ngg