cold deck at one level, hot at another level,

[allyasia]

i usuall play 25NL, just 3 days ago i move up to 50NL.
the move up to 50NL cost me losing 20% of my bank roll.
mostly of time, i get crap, and fold PF. when AK/AQ (AJ,AT suite i raise as well), i raise going in, cbet with on the flop, and i get reraise allin back to me...... AK flop q27 or AQ flop K59.
I have to fold .....
then when i raise going in, cbet on the flop that i hit. they reraise me all-in. i call, and got nail by set mines or over pair..... (4buy-in)
i know it's bad to call all-in with just TPTK, i usually lay it down at 25NL.
the reason i call, everybody reraise me all-in, when i bet the flop, when i don't have it, I have to fold, but when i have something, i want to see what the hell are they up to,
after all, i fold the blinds alot, i fold the flop that i miss, if i fold when i hit too, why the heck am i there???
out of 1335 hand, i have only got 1 AA, 2KK, 4QQ, 3AK.
however, my 25NL is continue to run hot.
so, how can i be so cold deck in 50NL and run hot in 25NL at the same time?
how should i approach 50NL?