Sneaky mobile redirects detected on


Hello Everyone,

I have received email from Google webmaster console. Title is “Sneaky mobile redirects detected on” Can anyone please tell me what is this happend? and how can I rectify this issue.I have tried new theme on my blog, a nulled theme, but linking to buy this theme. can anybody tell me is this issue occure due to new theme? as I’ve never seen this kind of message before.