no, its because i cursed you. in order to uncurse urself, u have to dump a cup of orange juice on yourself in the bath/shower within a week. 
Tactics Trainer iPhone curse?
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What! Be quiet! It's my curse! I spent 50 years collecting the ingriedients and performing the spells just to curse a poor chess player with an iphone! MWAHAHAHAHAHAHAHA!
Same issue...
Iphone screen is so small, and the board in the screen is even smaller.
My fingers? I can tap the h7 square and e5 at same time by same finger :)
I did a lot of mistakes because of that. It is silly. Try not to solve by iphone. Stop it before your rating is 1500... I have reached 1895 rating points by computer but whenever I start to solve by iphone, my rating decreases. Solving percentage decreases as well... ~60% - 40%...
Cheers
Well im glad im not the only one with this problem.
Okay so the last few days I did tactics and I hit an all time high of 2068 (that's not my all time high but it is after the update of tactics trainer, my real all time high is 2160) and then I stayed around 2000 after that... But today I did tactics on my iPhone and I just kept failing, idk why!! Is it cause the screens so damn small or cause it's just not my day or is it an iPhone curse!?