Bloated clip on time line

In the picture above, I have imported  a series of clips shot on two Canon cameras. (1) XF305 and (2) XF105

Problem - clips in timeline for XF305 = 2hrs 45mins in Video track No1 but on Video track 3, the clips from XF105 = 12 hours +. The latter plays back in real time. The timelinefor Video 3 in my view should be approx 2hs 45 mins

Any suggestions how ro fix? I am seeking to undertake a multicamera edit.

The clips shot in 35Mbps 1920 x 1080

Thanks

Dessie Lowry