ok, you have duplicated meta description and meta keyords in your header, you are using a seo plugin and I’m guessing it’s not configured correct for the home page (just guessing this part);
Check the seo plugin and make sure you don’t have 2 meta names like you have for your home page:
line: 9-10:
<meta name="description" content="Games, ταιν?ε?, σειρ??, μουσικ? - Οι τ?χνε? μ?σα απ? τα μ?τια των εξωγ?ινων" />
<meta name="keywords" content="games, music, movies, tv, shows, tv shows, news, reviews, παιχν?δια, μουσικ?, ταιν?ε?, σειρ??, ν?α, ειδ?σει?, κριτικ??" />
line: 55-56:
<meta name="description" content="Games, ταιν?ε?, σειρ??, μουσικ? - Οι τ?χνε? μ?σα απ? τα μ?τια των εξωγ?ινων" />
<meta name="keywords" content="games, movies, tv, shows, tv shows, music, miscellaneous, reviews, news, παιχν?δια, ταιν?ε?, τηλε?ραση, σειρ??, μουσικ?, κριτικ??, ειδ?σει?, ν?α, culture" />
while for the messages page:
line 9-10:
<meta name="description" content="Games, ταιν?ε?, σειρ??, μουσικ? - Οι τ?χνε? μ?σα απ? τα μ?τια των εξωγ?ινων" />
<meta name="keywords" content="games, music, movies, tv, shows, tv shows, news, reviews, παιχν?δια, μουσικ?, ταιν?ε?, σειρ??, ν?α, ειδ?σει?, κριτικ??" />
line 60:
<meta name="description" content="[cartpauj-pm]" />
-no meta name = “keywords” … don’t know why google does what it does but this should be corrected on your part.
Regards