2 New Esee's this summer for the homestead, Sencillo and 6. Sencillo blade stained on first use and it continues to get worse. What the heck? Pics inside.

gore: https://imgur.com/a/pTkomcg

I run a homestead in Appalachia, lots of long days, lots of knife work. Picked up a sencillo for EDC and a 6 for heavier tasks. After the first weekend with the sencillo, I pulled it out and it was all stained up, what appears to be rust on the actual cutting surface plus the whole blade.

It is POSSIBLE it came into contact with some nasty plant juice, lots of toxic plants about, but...that seems unlikely. It probably DID get used to open bags of sheep minerals, but it would have gotten wiped off. It was NOT stored wet, but it's humid here. The 6 has been carried probably equally and shows no damage. Both sharpen easily and hold a solid edge.

I CANNOT get the marks off the Sencillo, I've tried several different cleaners and scrubbing. It seems like the stain has soaked into the metal and now these apparent abrasions running lengthwise.

Any suggestions? Should I reach out to Esee and their warranty? This is my first and only A2 blade. I'm not really concerned with the logo and such, should I just buff it down to shiny and move along with my day? Anodize or some other protective layer?

Bonus question: I carry the sencillo reverse on my right hip with a clip, sorta high but very ergonomically and zero print on my clothes. The 6 obviously needs to carry way lower. I have the low carry sheath but it slaps against my leg and/or the sheath itself interferes with the handle, but maybe I'm just carrying it like an idiot. I'm on and off a tractor all day, what do you do for carry with a larger fixed blade like the 6?