Thank you for reporting the problem.
The fix is going to be provided with a minor update ETA Aug 11.
We will notify you as soon as the version with a fix is released.
Do not hesitate to contact us in case further questions occur.
We are glad to inform you that the issue with inconsistent behavior of drag and drop feature for calculated measures was fixed.
This is provided in the 2.8.13 version of Flexmonster.
You are welcome to update the component.
Please let us know if everything works fine for you.
Our team is wondering whether the fix did manage to resolve the problem for your case.
We are looking forward to hearing from you.