When I have my Clients in the calendar it sorts by Client ID as it should. The only problem is that some Clients have numbers and others just repeat their name where that number should be. Idealy there should be a number for every client instead their name twice. Does anyone else have this problem or know how to fix it??

Are you making the mod where you link contacts to the calendar? If so, I'd check the contents of the field you're using as your contact ID to make sure it contains just the serial numbers you expect.

Otherwise post some more details and we'll see what's what.

I was able to figure it out. Thanks!