Table names are encoded incorrectly - postgresql

Question

I'm using Grails 2.4.3 on Tomcat 7.0 with PostgreSQL 9.4. I have a domain object called Iteration. If I run Grails without Tomcat, the iteration table is created. But when I try to run war inside Tomcat, ıteration table is created instead of iteration.
I did not set anything in Tomcat configuration files or the Tomcat Service to enable UTF-8 encoding.
What may cause to this problem to occur?
EDIT: Here is my production settings in DataSource.groovy:
production {
dataSource {
dbCreate = ""
url = "jdbc:postgresql://localhost:5432/db"
driverClassName = "org.postgresql.Driver"
username = "postgres"
password = "password"
dialect = "net.kaleidos.hibernate.PostgresqlExtensionsDialect"
logsql = false
properties {
jmxEnabled = true
initialSize = 5
maxActive = 50
minIdle = 5
maxIdle = 25
maxWait = 10000
maxAge = 10 * 60000
timeBetweenEvictionRunsMillis = 1800000
minEvictableIdleTimeMillis = 1800000
validationQuery = "SELECT 1"
validationQueryTimeout = 3
validationInterval = 15000
testOnBorrow = true
testWhileIdle = true
testOnReturn = false
jdbcInterceptors = "ConnectionState"
}
}
}