I wonder how much of that is just the simpler hate of your current government as opposed to love of the EU. It's a further-away government so it's less intricate, less detailed, there's less to hate - it's not in the news as often with specific scandals or opposing parties.
There is indeed a general tendency to trust supranational more than national.
(There is a nice Ipsos poll on that... I try to find it)
There is also a tendency that when the trust in national governments is higher, the EU is trusted more.
And ofc there are local effects when a national government is very corrupt etc.
EDIT
Too bad... I can't find that specific poll back that showed that general tendency so nice.
Back on topic regarding Belgium
I think that while acknowledging that general effect you can for Belgium nicely see (the point I made in my answer to Kyr) how different the North and South in Belgium look upon their national government and the EU.
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