Different results when change select in simple query

Hi
I run two query
First
SELECT id FROM employee ORDER BY first_name DESC LIMIT 1,1
Result Id : 61394
Second
SELECT * FROM employee ORDER BY first_name DESC LIMIT 1,1
Result Id : 128257

Also when i run this queries
SELECT id FROM employee ORDER BY first_name DESC LIMIT 20 OFFSET 0
SELECT id FROM employee ORDER BY first_name DESC LIMIT 20 OFFSET 20
Id 80129 exists in both query (id is primary key)

The table is exist in attachment.