Guys, I just discovered that those high CTR values for my landing pages are because a hidden script that auto-redirected user to the offer page after certain time (it was counted as user click) if user doesn't click through the page manually. Silly me I didn't see that earlier, I really thought my LPs generate that high CTR naturally!
Remembert to check all files for malicous code. (.html, .css, .js).
Standard libraries (jquery) can be infected too if you just download from adplexity.