Tire "domes". What are the reasons?

I've got tires that stand like a house on a disk, probably the tire manufacturer made a mistake with the marking on the sidewall!
 

Don't rush to conclusions when faced with such a situation. You've encountered a simple "industrial approach" in tire production. Today, we'll break down the reasons in more detail.

An automotive tire is not a metal blank. Rubber is elastic, it can't always match the declared parameters with an accuracy of up to a millimeter. That's the conclusion reached by the ETRTO organization, which exists to determine and agree on tire sizes. Therefore, the manufacturer has declared a framework of a geometric box that the tire should fit into. An error of +-3% is the norm for a tire of any size.

Knowing this fact, let's assume that you bought tires, say, for a BMW, where the original equipment tires not only had parameters that were at the upper limit of tolerances but also had been homologated for your vehicle. Looking at the prices of replacement tires, you decided to opt for non-homologated tires and purchased tires without a special marking*.

But what's more, the tires, although of the same size, are at the lower limit of the geometric box. This is not a defect, the tire is within tolerances. But it actually has a narrower profile width. Recall that profile width is considered to be not the width of the tread, but the width from one sidewall to the other in an inflated state. Does it need to be explained that the tire will stand like a "house" and there's no mistake here? And if you also decided to change the wheels, you're adding another variable that can affect the final appearance.

There's no need to worry too much here, you just need to know that such a phenomenon exists in the world of tires. The main thing is that tires of the declared parameters fully meet all safety and handling requirements while driving.