Having difficulty with unwrapping a simple part of an object I am having lots of troubles unwrapping an object. I tried to start simple by selecting only part of the object and unwrapping that, but even something simple is not turning out intended.

Here is the simple part of the object being unwrapped:



I have tried Applying the Scale, using Ctrl-A > Scale and I have marked seams as shown below:



And here are the UVs after choosing "Unwrap" from the "UV Mapping" menu:



I have no idea why it looks this way. Can anyone add any insight?

Thanks!
UVs after choosing "Unwrap" from the "UV Mapping" might not be accurate most of the times so it would be better to choose "Smart UV Project" instead of "Unwrap".