Trouble after screen replacement

Hi everyone. Just to let everyone know that I'm sort of a dummy when it comes to phones and tech, but also new to here so sorry if I misplaced this question. So here goes.. I've broken my huawei p10 screen and had it replaced together with the lcd. After a day, when it was done and went and picked it up, I noticed that the scrolling isn't as smooth as it used to be, but much, much slower.. Sort of laggy. Also when I tap the screen there is this small, shadow like dot that appears on the left hand side and as soon as I let go of the screen it goes away. When it came back from the shop I had some apps that have doubled(two icons), that I deleted in the meantime. Anyone know what the deal is here? I googled and looked but couldn't find anything simmilar to my situation. Thanks