Text in a cell looks different for 2 different users

Hello we have a cell in a table which shows different text at the exact same time for 2 different users.
The cell is consisting of long text and this is the first time we have noticed this problem.
Is this a common problem or just a temporary glitch? And do you know of a solution? It has only happened one time but out of curiosity I would like to know if anyone else have experienced it and if its a known issue?

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