Start reading about handles in the manual or help file. That is what is going on here.
That's the way it is. However, if you double click on the transition you can reduce the amount of time the transition takes from say 1 second to 10 frames which will make the frames you don't want included less noticable.
Are you talking about this
Sorry for my ignorance but is there any real solution? Reducing the transition time does not help as the transition itself will not be that visible
You need to trim some frames off of your clip in the timeline or in the Source Monitor. Clip is too long.
You are probably working with one big file and used in and out points. The in and outpoints need to be closer together. You cannot put them on a change of scenes (which you probably did) when using transitions.
The answer is to adjust your In & Out Points to provide necessary Handles. These will give you some background on the concept of Handles:
It was a lot easier to grasp, back with either film, or in the days of A - B Roll editing.
Good luck, and hope that this helps,
PS - Handles are the reason that a videographer will start shooting before the target action, and continue to shoot for a few moments, when it has completed.