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it just dropped for 1 keyword and others are stable

and when I search brand its appear in SERP

Hi Experts

In a Single VPS with 1 IP, I have 2 domains. two months ago, one of them was in top 10 of high Competitive Keyword but from beginning of 2017 when I use site:aslejens.com the title of main page replaced by another domain on the VPS vahidafshari.com.

Is it a Google penalty?

Its not fixed yet . I couldn't see the metrics stats,

Hello Dear Experts;