I have looked into this myself some time ago, and the problem appears to be that some countries in Europe (including the UK) apply 'Incorporation Theory', while others (including Germany) apply 'Real Seat Theory'.
'Incorporation Theory' states that a company is governed by the law of the country where the company was incorporated. So far so good.
'Real Seat Theory', however, states that a company is governed by the law of the country where the actual decisions are made (location of company directors). In your case, this would be Germany. This means you may in fact be MORE personally liable now, since under German law your company is de facto German, but unlawfully so, and you have that way lost whatever protection you would have had under German law.
Again, caveats apply, I have a business but I am not an expert, though I feel you should consult one.