I've been saving up for a hand trail for about 3 days now. On Wednesday I decided to add a bounty to someone when I had 4,050 TC. It brought me down to about 3,950 (I paid 100 TC).

I logged on the next day and my TC was now 2,950. I was suspicious about me getting hacked all of a sudden, so I changed my secret word. I won a Judo tourney that day and got at least 3,500 before I logged off.

Today, I'm down to 3,450 TC, and I haven't bought any items so far.
What keeps happening? Is there a glitch in the bounty system?
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Wait a second... I checked my achievements page and I seem to have 3,604 TC. I still lost that 1,000 TC on Tuesday, but in the in-game window it says I have 3,476. Which one should I believe? o_o

The first drop (From 3950 to 2950) was caused by you purchasing the GUI Logo texture item. The Achievements page says you have 3604 QI, not TC. The ingame window should give a correct view of this. You're back up to 3450 because you won a 500TC tourney. Everything is normal.

But I don't remember buying that GUI logo. ._.
Oh well. Thread closed.
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Update: I just won another Judo tourney, so I should be back up to 3,900 TC again...