If I may put my 2 cents in ..
Most computer systems involving data, databases and data sets, use offset addressing.
Just to illuminate that;
A direct or absolute address might be something equivalent to 1234 Some Street, Somewhere.
An offset address might be something equivalent to 'x' houses up the road from 1234 Some Street, Somewhere.
Now, if you ever have a computer ( data ) glitch, you could end up in the wrong place.
If the data you are accessing is a list of words, instead of retrieving the desired word, you could end up retrieving a nearby word.
For example, instead of retrieving the 123rd word in the 'A' list, you could end retrieving say the 124th word in the 'A' list.
Thus you could see the results described.
As to what might cause the 'glitch', that's a whole other and longer topic.
Michael