twitching tinc

i recently recieved two Y patterned yellowback tincs. both are a year but still small, svl is less then 1". yesterday, i noticed the one that has spiderlegg moving around better but it's head was twitching.

i received these from the midwest and am wondering if the twitching is
a residual effect from travel or poor diet. all food items are dusted on
my end at feeding time but can't say anything about where they came from, sure they were well taken care of there too though.

thnx