Hi! This is my first post...I'm Italian, so sorry if my English isn't perfect.
I'm writing here because I'm having some trouble with my Ibanez GRG07 guitar which is equipped with an Ibanez Edge III tremolo bridge.
In simple words, when I push the whammy bar down (even gently) it returns up but the strings remain lower of about an half tone.
To get it back in tune I have to pull up the whammy bar in the opposite position.
The strings are about one month old and the locking nut screws are well locked.
Here is a photo of the bridge angle:

How can I fix this problem?
Any suggestion is appreciated.
Thank you!