When using 'generate' button, the number of 'weeks','days' or 'months' for corresponding interval turns to NaN.
When we click to 'Generate' button, the number of the period for specific interval is 1 as a default.
1-)Click to 'Generate' button.
2-)Delete the number of period for interval before specifying the 'Period start' and 'Period end' to add a number.
It turns to 'NaN' and ıt can not be changed even if specify the 'Period start' and 'Period end' after that.
Also, after selecting date range, the number of weeks/days/months corresponding to interval comes with ‘1' as a default. When the number is deleted, ıt turns to 'NaN’.To change it,we need to select NaN and press a number that we want to enter.