a) Your torrent client "knows" in real time what it downloaded / uploaded. However the tracker is updated by your client (usually) only in 30 minutes intervals by your client. Each torrent running on its own interval schedule. So up to 30 minutes up-/download can be different.

b) IP hopping between updates by your client will result in loss of tracking that intervals upload.

c) There is no place at GayTorrent.ru where you can see the total of upload / download per torrent like you see it in the client. What you see per torrent is the last uninterrupted connection session. Any interruption will reset to zero. It are life data from the tracker, not total accumulated history.

d) You can only compare the grand total upload and download of your client with the sum of all GayTorrent.ru torrents in in your client, if you kept them all in. Or you can compare the delta of those indications over a period (but need to consider mention a) and b)  for possible differences.