Multiple keys or shortcut keys being read when pressing shift, etc

Here is the problem, Whenever I press the shift key it presses the Fn+low volume shortcut key.' And when I press the caps it does the same thing but Fn+high volume. And when I press tab it presses the del button too And when I press the left arrow button it presses the ctrl button or the ctrl is being read whenever I press it. I have tried every possible solution that I search and its no use, I even cleaned it, nothing happens. And for other keyboards its normal, it's just this keyboard is expensive for me. Is there any solution or do I give up on this keyboard? It simultaneously press the oth

Question by Bernard Alfred Ramos on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.