Reddish tint in prints

I’m getting a reddish tint in my prints. Ten months ago I made the first tests on a 9900 printer, it has been sitting idle since then. I’m doing some prints now but they come out a lot more red than before.
In the tests I got a beautiful brown warm tone, not anymore.
Can the inks go old ? Is it too warm in the printer room ?
Any ideas ?
You can see in the photo. Same settings, same paper ( one in sheet, one in roll ).
Different images but you can still see the difference.

All Best
Johan