Keys on Keyboard not working

(TL;DR Some keys won't work when held together, only ones that don't work are the ones that are above one another)

(Sorry for the horrible explanation, first time doing this) For some odd reason, some keys aren't working properly when I hold another Key below it, (ex: 2+ W, 2 doesn't work and stops W from working, T + 5, same thing, etc.) I've tried to look up on  how to fix this and it's been doing this ever since I've gotten it, and I've had it for a good while but kept using another Keyboard to fix this problem, but sadly that's really uncomfortable for me.

Some info on my Laptop: Dell Inspiron 15 7000 Series 15.6"c LED Keyboard Lights

Sorry for bad explanation.