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Your Ad copy is being served by Ad Roation setting of your campaigns.
Ad Roations has four options that you can use based on your requirements:-
Optimize for clicks:- Your Ads serves on the basis of click, AdWords systems will show your ads that has received higher clicks.
Optimize for conversions:- our Ads serves on the basis of Conversions, AdWords systems will show your ads that has received higher Higher Conversions.
Rotate evenly:- It is good when you want to perform A/B testing in your ad copy and landing page. Here the system will Rotate your ads. But After 90 days, your ads are being served by either Optimized Clicks or Conversions.
Rotate indefinitely:- It works same as Rotate evenly.It does not any time limtations, it will serves your ads indefinitely.
When a campaign has two ads, why is one served 98% of the time, and the other only served 2% ?
It seems that your campaigns have opted either Optimize for clicks or Optimize for conversions setting. That's the resons that you one ads are getting 98% and second one only 2%.
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