Excel for iPad 2.63 syncing problem to Dropbox

Today I spotted an excel problem when editing a spreadsheet opened from Dropbox.

It seems that excel is saving edits while editing and those saves are not synced to dropbox. This results in a situation where syncing doesn't end correctly. 

It is a bug.

A workaround is to forcefully close the app and restart it... but once you step out of it the problem reoccurs.

Hope that MS fixes this soon!