You posted incomplete information.
There's no information about the GBP trades that you said were opened alongside the EUR trades.
Without full before and after statements, there's no way to know what happened.
The position numbers are different and they overlap in time. Without full statements, there's no way to know if some longs and shorts were not open concurrently. There's no way to tell if the longs and shorts are even from the same account. There's also no way to know if a margin call could really have legitimately happened or not.
You posted a statement showing all of those trades closed. We need a statement from just before the margin call and just after the margin call. We can't begin to investigate if you don't provide enough information.