Dash is 7 pt in the Properties panel also I can see 7 dashes (including sharp bend one) in the graphic. But gap is 0 pt in the Properties panel but there are 6 gaps in the graphic. How can I understand this differences?
There you set up the length of the dash and the gaps. But still this is weird. Can you perhaps upload the file to Creative Cloud and post a link?
Illustrator has the highly irritating habit to enter 0 in all fields automatically. If you enter a zero, then it will be really zero. If you don't, Illustrator will show a zero, but actually use whatever is entered as a dash and use it as the gap length. This throws you opff-track? yes, me too.
I used the easyupload link, but I jiust tried your Creative Cloud link. Tat is nearly working. The only thing you would need to do is to make it for everyone to download. Then it would be just gorgeous!
I uploaded the file following way.
The problem is that you added the second dash with 0 in the value and you didn't add its gap. If you remove this "0", it will work well.
No change if I remove "0".