Can you help me with my Photoshop Eyedropper tool issue?

Riddles    Photoshop CS3     Eyedropper, HELP, issue, photoshop, tool

I reinstalled Photoshop CS3 and my settings aren’t the same anymore.
I use eyedropper tool while digitally painting and hitting Alt(eyedropper shortcut) to pick a tone and then resume painting. Worked like a charm all these years.

Now the problem is , that when i hit Alt tool to pick a color the -background color- changes, not the one i’m currently brushing with.
This really drives me crazy, i cant work like that, constantly switching the background tone to the main tone.

Only way the right colour changes is when i already have the eyedropper tool instead of brush and press alt while picking a colour. but that’s exactly the opposite to how it used to be. ~~

I hope my explanation is understandable.
Help me please!

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