Thank you, Hilary!
I added second copy of this Repeating Table to other sections or at the bottom of the form, but it was not working, since initial copy was remaining in that section. After your suggestion I moved initial table to the bottom of the form and it started working.
Then I moved the table back and it is working again. This is very strange. Now it is on the same section, where it was not working, but this time it is working.
You putted me on the right way. Thank you once again!