Lookup table size problem

Dear All,
I used a lookup table. As per version 20.06 now the size of the lookup table is 15k. My lookup table having a size of around 10k. But when I test the questionnaire It shows me
the message “Value not save”

In all probability the message is not related to the lookup table.

But Why this message is occurred? If I used lookup table size less than 5k then It works

If any member of this forum can provide more advice on this question please engage.

I have read the question, but can’t give any advice due to poor description of the problem.