Softkeys disappear when using keyboard

So I have just noticed this morning when I'm texting....

Everytime I'm using the keyboard, the softkeys below (the back, home, task, and input method button) were... gone. Disappear. I don't know why, it was normal yesterday and I didn't do anything. It makes me kind of difficult everytime I have finished typing, because I have to tap on the screen, and cannot hide the keyboard using the back softkey. I have tried to restart twice, nothing changed. What is wrong? How do I get my softkeys back when I use the keyboard? I'm using the stock Lollipop 5.0.2, not rooted, and never did any modifications at all. Please, can anyone help me? thanks a lot. :( here i put a screenshot to show you what I mean.

I really do need answer to fix this. once again thanks a bunch!

Attached Thumbnails

 

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