A useful extra check, alongside disabling extensions, is to see whether the tab is being detached by a drag rather than opened as a new window. Try opening a tab with Ctrl+T and with the + button, without moving the mouse after the click, and compare that with middle-clicking or right-clicking a link and choosing to open it in a new tab. If only a dragged tab separates, it is usually the tab strip picking up a small drag movement. You can drag that separate window back onto the tab strip of the main window, and keeping the main window maximised makes an accidental drag less likely. If every method still opens a separate window, note whether it also happens in a private window, as that helps narrow it down to a setting or extension rather than the tab button itself.
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