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Fragmentation flags in IP Header

Hey! I have been observing ip-ethereal-trace-1 in which I noticed an unusual thing.

When we have a packet that is greater than 1514 bytes, it gets fragmented. So when it is fragmented, Flag of More fragments is set. When it doesn't need to be fragmented, Flag of Don't fragment is set. But in packet 378 and 379, I have noticed that both the flags (Don't fragment and More fragments) are set. Can anyone help me for that? Why is this happening?

The file ip-ethereal-trace-1 is available on the internet.

http://gaia.cs.umass.edu/wireshark-labs/wireshark-traces.zip