hmmm... okay, wait... you have replaced half the torso sprites, and the first set of moving legs animations.
so basically, you
should see a dalek with secotid arms and legs when facing right, left, down or up (diagonally, for in-game-tile purposes) and a normal sectoid for the other directions. you
should also see a dalek when moving in the right-up direction ("north" in the mini-map).
from my experience with the Interceptor for the skyscape alternative interception mock-up, you probably shouldn't use the torso
at all. why? because the game is hard-coded to have the torso bobbing up and down while walking
so simply replace the "standing-still-legs" (frame 17-24) instead, and make the torso sprites transparent blank, as well as all arms.
I can't really see why your version should be all weird in-game. the frames look fine in pckview. perhaps you didn't "replace", but "deleted" and "inserted" instead, and now the indexes are wrong? try clicking on the frames in turn and watching the number in the lower-left corner of the pckview window... if the numbers are not in order, something was messed up