You appear to have enabled Opera’s native ad blocker. The ad blocker inserts non–lethal elements in a page‘s code to restructure the layout after blocking ads.
VirusTotal is a service which scans selected files with multiple antivirus engines. Settings for these scanners can be much different than the settings used on typical computers, and sometimes they report what we believe are false–positives. This happens especially with Antiy–AVL, Baidu, Cylance, and Qihoo 360. Please don’t report this issue to us unless antivirus…
First of all, ensure that Opera’s native ad blocker is enabled and try enabling additional lists in Opera settings (Opera menu > Settings > Basic > Block ads > Manage lists…).