Can’t export to OMF

Hello, can anyone help me with exporting my sesx file to OMF so my sound designer can access? I'm getting a "clip duration is longer than the source". Initial research suggests the clip was stretched but it wasn't as far as I know. Instead I think my source material exceeds the length of the project (project is 40 minutes) some clips are an hour or longer. Any suggestions? Do I need to import shorter source clips?