Since you're already done with the edit, your quickest fix is to use the Fill Left audio effect (Audio Effects > Stereo > Fill Left). Apply this to all the clips that are not playing in both channels; it will duplicate the left channel into the right. The Fill Right effect would do the opposite.
Ahhh!! Thank you so much - had been searching on the internet and toying with it for hours lol. You rock!
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Glad that helped! Next time, you can use the Modify > Audio Channels command to handle this before editing. If you only have audio on the left channel of your stereo source clip, or don't care about what's on the right, you could set the stereo audio to be treated as dual mono. When you put the mono source tracks into a sequence with a stereo master track, the mono source will automatically be routed to both stereo output channels. You can then use the Pan knobs in the Audio Mixer to position each sequence track in the stereo spread. This has to be done before you use the source clip in a sequence, however.