Apache Camel Timer is running Twice

Currently facing an issue of Apache camel Timer running twice .

Spring DSL xml
Timer :
groupId : org.apache.camel
2.15.1
Spring Version : 4.1.6.RELEASE

Timer timings set 30s but its running twice within the 30s
Example : Pollar Trigger :04:01:55.582
Pollar Trigger :04:01:59.010

Pollar Trigger :04:02:55.582
Pollar Trigger :04:01:59.010

Need to know how to restrict running twice.