Font size settings auto reset after reboot

Hi,

My Xiaomi Mi 4c on MIUI 7.0 is having font size problem after every reboot / restart.
It always change to default size, which is S.
Everytime I change to XS and the reboot, it will always default back to S.

This not only happen to phone font settings, it happened to whatsapp font settings too!

Does anyone know how to fix this?

Thanks

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