[ask]Few KW goes down after few NF Backlink added

Hello, i want to ask about what gone wrong with this statistic..
in a week, i notice few of my kw for 1 page goes down..
i check backlink added around 21-Nov until now and i found few NF backlink.
it is the cause? or something else? i will share my report below.


am i doing something wrong? please help with your comments.
thank you

Sorry if i post it in wrong section

NF has nothing to do with your ranking.
But you need NF for your natural looking link profile.
I try 25-40% NF.
Maybe you need to add more quality BLs.

Buy some du follow links to recover

Add Good quality of do follow links