Help me (Vlookup)

hi my problem here is that i get this #NA thing anytime i select a product
code more than twice.

data is formatted as tables in the lookup sheet with 757 rows.
my other sheet is just 5 rows but i have used data validation liminting the
entry to the codes. but i have realised that a few minutes a go that the #NA
keep coming up but when i choose a different code it gives me the the product
name.

if choose
lCQ 1
LCQ 2
LCQ 3 this gets me #NA
but as soon as that is changed i get a name
any reason for that please.