Mamiya 645 wants faster shutter speed for lower ISO and visa versa?

Mamiya 645 wants faster shutter speed for lower ISO and visa versa? Had the Mamiya 645 pro with the AE prism for two days. Worked fine yesterday and bought it from KEH cameras in the excellent rating”. Today I wanted to shoot ilford 3200, was going shoot at 1600 and develop at 3200. Suddenly my light meter is being weird. When I put it at ISO 100 ( just to see), it tells me to shoot at slower shutter rates, tha...

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