Same here, but FSX and also using another company NavDataPro.
Example:
I parked the 757 at EDDK wanted to fly to EDDM. I put/ entered on the RTE page: Origin: EDDK, Dest: EDDM.
And ........when selecting at the DEP/ARR page the EDDM ARR page to get the EDDM Arrivals, the CDU shows weird things at the first page. Please see the pic 2.

I then did/ tried: EDDM to EDDK with .........the same result, see pic 1.

Threre are some more examples.

From my point of view, there is an issue between the another company NavDataPro and the CS 757 CDU......, or the 757 CDU can not read the another company NavDataPro data "properly".

By the way, that issue leads to CDT.

CS Team, any ideas?

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