Nothing is guaranteed with search engines, and it probably means that some links that may have passing value now aren't.
and of course checking rankings is a pretty useless pastime because:
A: You only see what you see and nobody else sees the same.
B: You will search like a site owner checking rankings so whenever a new url appears for the same keywords YOU get to see it first and high in the rankings because that is what Google thinks you are interested in.
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A foolish consistency is the hobgoblin of little minds
Thought for today:- Is SEO the only industry where all the cowboys are Indians?