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Hi @Johanfritz, welcome to our community!
That sounds very strange, haven't seen anything like that myself.
Could you please check so you don't have activated any setting in the Accessibility menu in your phone? You can find that menu in Settings > Accessibility. Check the setting called "Color inversion" and make sure that this is turned off.
Go back to Settings and check in the bottom of this menu if you have something called "Developer options" here, if you do, tap on it and disable it.
If you still can see these small boxes in the status bar, could you please take a screenshot and upload it here? To take a screenshot, press and hold the power button > Take screenshot.
Let me know if that helps! 