Merged Clips in FCP not reconnecting properly

Hi all,

I'm having some issues reconnecting some merged clips. When reconnecting the following msg pops up:

Some of the attributes of one or more of the files you have chosen do not match the attributes of the original. These may cause problems within the sequences dependent on them. The attributes that differed are as follows:

- Media Start and End.

Seems like 95% of the other merged clips in my project reconnect just fine but about 5% aren't reconnecting right and the problem occurs quite randomly.

Any ideas of what may be the problem and how I can fix it?

Thanks.