crwdns2893792:0crwdne2893792:0 Minho ,
This definitely looks like a poor quality screen (as to be expected. from Amazon/eBay suppliers). It is possible you damaged something or screwed something too tight so you’ll want to double check that while your are at it. As for the LCD adhesive, once you open it up, the adhesive will peel away irregularly. This brings up an important point when doing screen replacements. Always text the screen with the phone partially assembled before you lock it in. There’s nothing worse than sealing the device before noticing an issue or a forgotten screw or shield :-(.