spindlewood

A couple of times I've stopped my car at a stop light and shut off the engine. When I turned on the car and continued driving, there appeared on my HUD a 25 in a red circle flashing. I think the inner color of the circle is orange which makes this a Sweedish speed sign (I'll have to pull over next time and take a photo to verify). The speed where I am driving when this has happened is not 25. As soon as I pass a speed sign, it corrects itself.

Anyone else experience this or have an idea what is going on?