Thank You sir, 

2 reasons:

1. You was hacked. Check all not official plugins

2. You placed wrong code. Especially check your lomadee verification code,
because it's in the same place with this code

Sir, my website "www.mediastrone.com" in that some un-identified code is showing in all pages and product pages (hOctOsNFt1kSMaUMzsA5MuC68Sl/cUozwGb30B/KDV5lSdfIKmgLNA==), I don't know why its showing. Please help me to resolve this. 

If You Need any credentials I will provide. Thank You