Ok, I found whats causing it.
Touchpad's far right side acts as a mouse wheel which is easily tuched unwillingly or unknowingly.
And in winuae in Input settings/windows mouse/Wheel[+/-] I had 'alt', changed to 'none' and by the quick test, thats it!
Sorry guys for disturbance. But if I hadnt write it here I probably wouldnt sat down to figure it out myself whats actually happening.
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