casio: stored numbers keep changing!? (1 Viewer)

Exp

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My casio fx-82AU Plus calculator's stored numbers keep changing somehow and I don't know why...
Letters A-D are all fine but when I store numbers into X,Y,M and come back a bit later, the numbers change!

How can I fix this/ what am I doing wrong?
 

BLIT2014

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Maybe try doing a hard reset back to original settings?
 

BLIT2014

The pessimistic optimist.
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Or take the battery out then back in again (or replace the battery).
 

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