I use FAR 1.70b2087 and WinSCP plugin 1.6.2. It reports wrong total filesize in directory. Size may be tens Kb larger than the real size. When I select all the files by Insert btn (or, * keypad), it shows correct size. I.e., panel indicates different sizes for same files:
1,343,463 bytes in 261 files (for selection)
1,371,111 bytes in 261 files
This isn't a big problem, but it may be annoying and unexpecting for some cases.