A "common misunderstanding" refers to a situation where many people have the wrong idea or belief about something. It means that a lot of people misunderstand or misinterpret the same thing. Full definition
Let's start out by blowing away the most common misunderstanding about accessibility at multifamily properties: mandatory ADA units. (propertymanagementinsider.com)
A final note: One common misunderstanding in our area is that fleas are a seasonal problem. (pilchuckvet.com)
A very common misunderstanding about asbestos is that it can be cleaned up with little effort. (educationbusinessuk.net)