5f1e3b1 created the issue

When I synchronized two folders between local and remote, I chose "Mirror".
In synchronization window, I clicked the files I just edited locally,
and saw the "Details" say that the remote files are indeed older than local files(about 5 days), but they were not "checked"! So when I click "Continue", none of those files were transfered, of course. Only those not existing on the local or remote were transfered. After that, I check the modification date of those files, the local ones are still 5 days newer than the remote ones!
This situation remains even if I chose "Upload".

By the way, I am using sftp. But in version 2.7.3, this error didn't happen. I prefer the new synchronization window, so I hope this problem can be solved.