Mazda 3 Ajar rear right door only
 

So I bought my 5-speed Mazda 3 2013 a few months ago and last week I realised that my Ajar sensor only beeps when my rear right door is opened! What I mean is that, when my lights are ON, my Ajar should normaly beep when I open my door to indicate that my lights are ON so I don't forget them. But instead they only beep when I open my rear right door... which is completely useless. I tried to remove and put back in the ''room'' fuse, but it didn't do much!

Is there someting that I can do to fix it that won't take me too long or do I need to go open up my doors and switch anything?
(I searched a bit on the forum and on Youtube but I didn't find anything about my issue)