GEDCOM data confused on import

When importing an abbreviated GEDCOM file (exported from Legacy 7.0, format Gedcom 5.5 "generic"; see attachment), some of the individuals' information is confused.

For example, if you look at the Individual entry for Adam Browne (me), you'll see:
- birth date is missing
- birth place is incorrect
- mother's name is given as father
- father's name is omitted altogether

If you look at the Groups index in general, you'll see:
- a lot of "Error!" messages
- couples entered twice
- one person entered as a couple, using the given and surnames