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Now, this answer makes sense. Thank you for the technical and detailed answer.
 Appreciated !!

Thanks!

Thanks for your quick reply, Chris.

Yep, it is ignorable somehow. But I was quite worried about it when it came to a big difference.  I took another KW example and it showed me 25 and when I clicked that KW, KD was 35.

It's quite surprising for me.

Hi Folks,

I was doing reverse reengineering one website today. I put that website in Site Overview and for a specific KW "lesco bill estimator", KW difficulty appeared as 21 in the columns grid but when I clicked on this KW to check other stats like CTR and priority, etc it showed me a different difficulty which was 18. It is quite confusing for me, why there is a difference and which one is correct?  For reference, website is "https://lescobillonline.net/" and I've mentioned that Keyword above. If someone answers this questions it could be helpful for others to understand the algo behind this situation or scenario.

Thanks, MOZ Community !

Cheers.

Shannon!