Why out marker is placed one frame after the playhead?

I have the same issue, its was working fine after update. Its a bug or some settings?

Not at all. The current time indicator ... CTI/playhead ... is not a dividing line. There is no real in-between frames thing in an NLE. There is always an 'active' frame. There are no spaces between frames.

So the CTI is always connected with a frame ... the frame after the line. The line doesn't divide your sequence, it illustrates which frame it is connected to. For better example, use the + key to zoom way in. After a certain point, you will see a blue line appear at the top of the sequence ... which is the horizontal display of the length on the seqeunce of the current frame.

To set an out point, it's better to use the keyboard shortcut "Go to selected clip end" ... search for that in the keyboard shortcuts screen. Set a custom key-short for it. That way you can simply hit that short instead of the say down arrow and get to the right frame to set your outpoint.

Neil