I try to preprocess some excel documents with VLOOKUP function.
Disclaimer: This is not real data that I need to work on, but some demo data with same problem!

The vlookup function for left columns is
=VLOOKUP(B7;$D$6:$E$10;2;1)
and for right one is
=VLOOKUP(K11;$M$8:$N$13;2;1)
( of course, the first number is changing, B7, B8,...K11, K12, ....)
What is wrong:
On the left side, there appear as there is no key, but is is.
On the right side for lidija, the value should be j and not y.
I couldn't find what is wrong even though I search on the net quit a lot.
Some thinks that (it is obvious from picture and description) I already check:
(and it is stated as most frequent problems)
I lock the cells (see code above)
The key exist - you can see the key in table, and I do it with copy and paste
It is not a space problem (I check that none of the cells have space at the end)
TrueorFalse.1beingTrueyou are doing a "Range Lookup". Perhaps change that last parameter toFalseand see if your problem (whatever it is) goes away. - JNevill