Limited number of ringtones iPhone

I have created about 50 ringtones and they all sync. Check the file type and check the length of the ringtone. I think the final cut off for a ringtone is between 35-40 seconds, I accidentally made some 42-seconds and of course they wont sync.
HP G72 B66US 17.3 Laptop Windows 7 iPhone 4, iPhone 3G, iPods and other Gadgets.

Thanks, but all ringtones are 30 seconds or less, all are in the .m4r format, and all appear in my iTones ringtones folder. I can select any six of the eight ringtones and they all play and work just fine. My only problem seems to be that only six of the eight will sync at any given time. Seems weird to me. I was thinking that maybe there was a setting somewhere that limited the number of ringtones, buy your experience pretty much negates that.
Mac Book Mac OS X (10.6.6)

Yes, I have the sync set to sync all Ringtones in the folder and they all sync except when I make one too long by accident.
HP G72 B66US 17.3 Laptop Windows 7 iPhone 4, iPhone 3G, iPods and other Gadgets.

Right-click each ringtone in iTunes, select get info. Are artists names listed? Are any of them the same? If so, this could be your problem.
MacBook Pro

No, each artist is different. None of the ringtones exceeds 30 seconds. All of them work just fine. The only problem is that a total of 6 will sync. It doesnt matter which ones I choose. If I choose 7, only 6 will sync to my iPhone.
Mac Book Mac OS X (10.6.6)