Text cursor jumping?

Good morning, some internal users have found that the text cursor (ie the blinking line rather than the I-pointer) will move unexpectedly while they type (mostly while they edit target segments that are already populated), and either select unwanted text or jump to a different part of the segment. Have any other users had the same issue? 

Asking here before I log a support request as it will be almost impossible for Support to reproduce. 

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