Fix: data.timeline = id; instead of data.timeline = i; https://github.com/ateliee/jquery.schedule/blob/ad527786e98b914ca79c293f9cb55ffe9cae1bae/src/js/jq.schedule.js#L600
Fix:
data.timeline = id;
instead of
data.timeline = i;
jquery.schedule/src/js/jq.schedule.js
Line 600 in ad52778