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LMX1204: Problem with setting multiplication on clockout

Part Number: LMX1204

Hi, I have a strange behavior on my lmx1204. The problem is that then I configure the component as multiplier on R25 and then multiplication factor in R26. Then I read back the registers, the values has changed. The returned value of CLK_MUX is 0x4 (Not a valid value according to the datasheet) and CLK_DIV is has the value of 0x0. I have verified that the SPI communication and the driver is working, so there is not problem there. What parameter I’m missing to get this strange behavior ?

Example of log:

WritingR25(0x67FF)

WritingR26(0x41)

ReadingR25(0x8277)

ReadingR26(0x4940)

Best regards,

Jonas