Ksqldb table messages inconsistent

Stream Processing ksqlDB
1

I’m new with ksqldb and I have one situation, I have a topic and I put some messages and create a table but ksqldb puts “”.Why?Any idea?
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Thanks

ksqltable
ksqltable708×726 23.7 KB

2

Seems you string is "18" and not 18.