Please is it possible to post your trigger code here .
May be you have kept the event both insert and update ,So that when you will insert record in your object some other code will update your record ,So that your trigger is executing .
Only possibility for this is that there are a workflow on the object which have field update workflow action. When the record is inserting and match the entry cirteria of the workflow then it will update the field of the record. This will couse re-fire the the after update trigger again one time. You can check the execution process of salesforce in this link (https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_triggers_order_of_execution.htm)which will help you.
If this answer help you then please select this as best answer.
Please is it possible to post your trigger code here .
May be you have kept the event both insert and update ,So that when you will insert record in your object some other code will update your record ,So that your trigger is executing .
Please let me know if it helps .
Thanks
Manoj
Only possibility for this is that there are a workflow on the object which have field update workflow action. When the record is inserting and match the entry cirteria of the workflow then it will update the field of the record. This will couse re-fire the the after update trigger again one time.
You can check the execution process of salesforce in this link (https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_triggers_order_of_execution.htm)which will help you.
If this answer help you then please select this as best answer.
Thanks
Please create your trigger like below :-
you can see trigger framework in below blog. I hope that will help you
http://amitsalesforce.blogspot.in/2015/06/trigger-best-practices-sample-trigger.html
Please mark this as solution if this will help you
Thanks
Amit Chaudhary