My screen keeps acting like im sliding my finger/not registering taps

About a month ago i broke my iphone 6s screen (not the lcd just the screen) and took it in to a non apple store to get repaired. (apple was refusing to repair it all together even though their website says they can repair screens for a price outside o f warrenty) I got it back that day and and ended up purchasing a screen protector along with the new screen. I had no problems for a couple weeks, then one day i was on facebook trying to tap the exit button on the top left and my phone kept registering my tap as a slide to the right. (when you already have an app open this acts as an alternative to going to the "open apps" screen instead of double tapping the home button) this problem only arises when i tap the left side of my screen and happens more often in the corners but occasionally happens in the middle of the side. Then a few days later i opened a game i have on my phone, this game allows you to select units by clicking them once but you are able to open a seperate screen by double tapping the same units. About 2 out of 5 times when i go to just tap a character it registers as a double tap and opens the second window which is really annoying. The 3rd and final problem is while im trying to text it tends to not register when i hit certain letters especially the space bar. Could the causes to these problems be caused by a improperly placed screen protector? or could it be the replaced screen? or perhaps another problem i cant think of.

PS. there is a small crack on the bottom right of my screen protector, but i doubt that could cause the above problems