It's not documented, but that's what I call "pity mode" on TT. If I miss several problems in a row, the TT starts repeating the ones I've missed. It's actually a pretty neat training tool. As a diamond member I usually do at least 25 a day and this is a quite common occurence. If I'm really screwing up (not an unusual event) TT goes into what I call "dumb sh#t mode" and feeds me the same problem several times.
weird tactics trainer bug
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each day I do 3 tactics as that is the limit for basic members. today I started by failing 1, then I passed problem 30871 , using about 20 seconds total thinking time.
Then when I pressed the button for the next tactic exactly the same one came up! I passed in 2 seconds as i already knew the solution. I have never had the same tactic appear twice in a row before.
But then when i looked on my stats page only the second time I passed the tactic appeared in the history. It only displayed 2 tactics being done today. So it let me do another tactic! which i passed.
2 screenshots:
this is the history. Notice the large rating increase(2099 to 2133) this is because I really passed it twice, although the first time doesn't show.
And this is my chart showing pass/fail % per day. Surprisingly both attempts show here, and it correctly shows me as having done 4 tactics today (although 2 were the same one)
I dont mind having the extra free rating points much but thought i'd better point this bug out.