I've added a screenshot, so you can see this, and as you can see, it happens only for few files (every time the same files).
TW1943_2.jpg, the first is not synchronized while the latter is.
TW1943_2.jpg: Imo, WinSCP behaves correctly. To debug this further, I'd probably need a log for the consecutive synchronization. In which, if I understand the problem correctly, the file is synchronized again, despite being synchronized before already.
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