Sorry, we have no clue. All we see are the visual differences.
We don't see how the comp is set up, we don't know what you mean by the "numbers codec" (there's no such thing), we don't know the effects you're using... there's a lot we don't know.
But answering the litany of diagnostic questions you'll find in this link will help:
I'm glad you posted a screen shot. As a general rule, since we are trying to determine if your project settings are erroneous, it helps to have screen shots of those settings.
Are your frame rates the same across all the different platforms?
The efect is set to time and in this mode respects different timezone notation depending on the language setting....
I have just checked on two different Macs. One where it works and the one where it does not work. Time Zones and language settings are exact. :-/
Are you sure these are the same comps? There is an extra line of text in your screenshots so you're either missing a font or you're missing a layer. Also, there's no setting in Timecode to display AM or PM. It just isn't there. There is an option to use Media Source TimeCode which would pull the time from a Layer. If you have Footage that has some weird AM PM time code and you're using that as your source for the timecode there may be a remote possibility that you'll get an AM or PM in the time code. Set the TimeCode plug-in to read the comp or apply the effect to a solid and those problems should go away. I don't think this is an AE problem. Timecode isn't a smart filter that uses system time or anything but footage data (when applied to footage) or comp time.
Taking the language and time from Danish - back to english - and then back to danish seemed to do the trick! somehow it hadnt registered the first time. I then had to delete the After Effect project from that computer completely - Copy it back to the computer and start it back up.
Thanks alot guys! Quick responses and all!