Changing note's duration results in erroneous notation

This error is 100% reproducible; whether it’s at the beginning of a flow or in the midst. I’m on iMac, High Sierra (10.13.5)
Here are the steps:
I create a measure with time signature 5/8 and input a note that last the entire measure - i.e. a half note tied to an eighth.
Screen Shot 2018-07-06 at 10.40.50 AM.png
Then I decide to shorten the note by one sixteen.
So, I change the grid to sixteens and press the following keys: option + shift + left arrow.
And here is what I get:

Curiously, that erroneous whole note does not affect the playback - the entire score is played back as expected.

Am I missing something?
Igor Borodin
Screen Shot 2018-07-06 at 10.41.38 AM.png

One of your pics is missing, probably the one with the whole note.

I’m sorry for the missed screenshot.
Here it is:
Screen Shot 2018-07-06 at 10.41.38 AM.png

Apparently, something was wrong with my system. After restarting the machine, changing note’s duration works as it’s supposed to.
Sorry for the false alarm.