You have inadvertently activated Overtype mode, probably by pressing
the Insert key. Press it again (or double-click OVR on the status bar
so that it greys out) to turn it off.
Probably because you've switched to overtype mode - you'll probably see that
the 'OVR' on the status bar is black, rather than grey. Try pressing the
insert key, or double-clicking the 'OVR'.
Cheers
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