And on a log cabin, you're really only dealing with ONE strip at a time, and for a limited length, so sometimes this can be happening but you don't notice it at all -nor is it causing a problem in your block - because the pieces are relatively short.
It really only becomes evident when you're doing long - specially 40" WOW - strip sets.
It's not so bad trimming them up...but make sure to toss the ones that just won't fit.
Do we get to see the fabric selection?