touch screen: the upper part of the screen does not respond due to the bounding box

The upper part of my screen does not respond mostly, in addition to the option button and the button to customize the notification bar.
I discovered that there is a bounding box where the screen does not respond, however, I do not know if there is a way to see what application it belongs to.

I also installed a lot of applications to personalize my phone, including Substrate, Fluid n.g., Rounded Corners, and many more that may have caused all this.

Here is also a photo so you can see what I'm talking about:

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So the area I'm talking about is the purple rectangle that stops right above the text (wifi, bluetooth, …)