Hi @sarahkay, thanks for your query. Indeed the fixation co-ordinates reflect the position relative to the maximum pixel dimension of the screen, so a screen at 1024×768 resolution should produce values of that range when looking at the bottom right, which is why your values seem unusual.
Can you run the “Interaction_Streams_102” sample from the Core SDK samples @ https://github.com/Tobii/CoreSDK and report the values returned just to double check? Thanks for your patience whilst we try to resolve your issue.