Problem trying to get character to look at mouse?

Hi guys im currently trying to make a 2D shooter similar to something like Intrusion 2, currently at the stage where i have a character and am trying to make it so he always aims at the mouses location. It works perfectly if the character faces right, but if i turn him around the arm faces is the exact opposite direction of the mouse.

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The problem is in axis. Move everything in one quarter, so that your mouse doesn’t move over X or Y Axis.