Need help with selection tool

I made a rectangle selection and wanted to deselect it. I didn’t press the shift key anywhere ,I left clicked somewhere in the canvas and it creates a spot (idk it’s a slice)and increases the area of the selection, I’m unsure whether this is a bug or not, is there a setting to stop this?
Here’s the link to a screen capture.

hi, vats. it seems to me you are in add mode. check the buttons in the top bar.

Um can you please specify where, I couldn’t seem to find it.

top bar:

Thanks it works now

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