Hi there, greetings from a little north of you.
Suspporting the views of the other posters so far:
1) Bützow is not too far away to the first null of the 28E & 28F. this means that you will have a harder time now than before 2E/2F. Any misalignment or wrong set-up will amplify, and give you no signal.
2) Your skew is definitely wrong, as the other esteemed forum-members have pointed out. Looking at the dish standing in front of it, the LNBs should be leaning to the right. About 5 degrees. Mine do.
3) As clown man says, the LNBs are not pointing to the center of the dish. That is clear from the pics. The end of the LNB arm seems to bent at a slight angle, and it does appear as if it is upside down. Let me repeat that: The LNBs must be pointing to the geometrical center of the dish. Else you will not get full advantage of the whole dish surface.
4) There are indeed two LNBs on the arm. It looks like one center, and another on an extension bracket. The center one should be 28.2E one.
5) The elevation of the dish may be wrong. All my "normal" offset dishes (recent designs) are around 23 degrees, and they are all point slightly upwards (ie. "leaning back"). The dish rim should be inclined slightly backwards. Check with a spirit level.
What to do, then?
a) Correct the skew of the 28.2E LNB, and see if this makes it any better.
b.1) Check that the LNBs appear to be pointing at the center of the dish. Hold a flashlight (or better a laser pen) at the front of the LNB, align visually seeing from the side, and check where the focus is. this is not center of the rivets, but more or less halfway between the top/bottom and left/right.
b.2) Check the eleation of dish with spirit level. If it is not point slightly upwards you wil have a problem.
b.3) Check that the 28.2E LNB is center.
==> Fix the alignment of the LNBs. This may involve turning the main mount arm upside down, and checking if this is better.
==> Fix the alignment of the dish (both azimuth and elevation) - follow the simple guidelines elsewhere on this site to align the dish *AFTER* you ensure the LNBs are pointing at the center.
If all this seems daunting, you may want to consider calling a professional for help. But do call someone else than those who fitted it, 'coz they seem to have botched it....
Else, post back with more pcitures, and we will try and help you.