ᐅ Gap between window units

Almost two years ago, we received new units (1 window, 1 door) from a window manufacturer. Previously, we had used Veka products for almost 40 years. Because of the convincing quality, we chose elements from the same company again. The installed units are from the series VEKA Softline 76 AD.

At the junction between the door and window (transition), we have recently noticed that the gap at the top has widened, so it is now visually noticeable at first glance.

We are concerned that the gap might continue to increase over time, possibly causing further damage such as leaks, stress damage, etc.

The window installer told us that this is a "movement joint" which can change due to temperature-related expansion or contraction. They said it cannot be guaranteed that the gap – the visual impairment – will get worse. They also said it cannot be fixed or repaired, only covered with an adhesive strip.

Now we are wondering if it really is a movement joint and if such extreme irregularities can occur over time, and whether a repair is truly impossible. Nothing like this ever happened with our old units. Covering the appearance with an adhesive strip feels like a “dirty” solution to us, since we did not buy the units to look like that, and if the gap grows larger, the adhesive strip might even come off over the years.

I look forward to your support.

PS: Attached are some photos.

The explanation seems plausible to me—especially since the issue of the "covered joint" is repeated above the windows as well. There is nothing broken there either, just aesthetically unpleasing.

Thank you for your assessment.
Above the windows, the "cladding" is originally like this because there are two roller shutter boxes. Normally, there is no cover between these elements. We didn’t have one before, it wasn’t included in the offer either, and visually it wouldn’t blend harmoniously with the overall appearance in the future.
If there is an uneven gap on a car, nothing is glued over it; instead, it is adjusted.
An "unattractive" feature can also be considered a defect if the actual condition deviates from the intended state. Since we are not experts, we wonder whether it is really "just" an aesthetic issue, or if something else might be behind it or if there could be consequential damage. The joint also appears to move unevenly, only at the very top area.

No defect, windows will warp over time

I am aware that windows can warp over time. However, we have never experienced such an extreme visual change anywhere before. One might think that current models are more durable than windows that are almost 40 years old. When the window installers were on site for a different issue, they were at least very surprised and puzzled as well.
I am also surprised that it cannot be adjusted.

What surprises me more is that the frames were built directly next to each other.