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The reason you may not see data for metrics such as clicks and conversions in the Ad Extensions widget which is present in Google Ads is that Google Ads reports this data for All Extensions, it is not just for a specific Extension.

The clicks that you see by default against the extension are for any click that happened on the ad when the extension showed. This is the case with other metrics as well. The data you see in the reporting widget in Optmyzr is for that specific extension. It is possible to see this data in Google Ads by selecting the segment 'This Extension vs. Other'. That will show you how many clicks that extension actually got and how many clicks other extensions got when this extension showed. 

In Google Ads, you can segment the data and the numbers you see for 'This Extension' should match what you see in the Optmyzr widget. The reason we show data in this manner is that the numbers you see in Google Ads under the default setting can be misleading.

Google Ads segments data in two ways - Advertising Channel (Search, Shopping, Display, Video) and Networks (Google Search, Search Partners, Display, YouTube Search, YouTube), and there is some overlap between the two. 

For example, Search is an advertising channel as well as a network. However, when you look at Google Search as a network, it includes data from both normal search campaigns and shopping campaigns because the traffic is coming from there. 

When you look at Search under channels it does not include data from shopping campaigns. It only includes data from search campaigns.

In Google Ads, when you select a campaign type on the left (Search, Shopping, Display...) it selects the advertising channel and not the network. In Optmyzr when you select Google search, it selects the network. 

The data you're seeing in Google Ads is only for search campaigns on Google search, it does not include data from shopping campaigns. In Optmyzr, when you select Google Search, it includes data from search and shopping campaigns. The difference in data is what is coming from shopping campaigns.

The clicks that you see in Google Ads by default are for any click that happened on the ad when the extension showed, whereas the data you see in the reporting widget in Optmyzr is for one specific extension. It is possible to see this data in Google Ads by selecting the segment 'This Extension vs. Other'. That will show you how many clicks that extension actually got and how many clicks other extensions got when this extension showed. 

The Google Ads API lets us retrieve performance data for local service ads but doesn't guarantee its correctness. Because of this, you might face issues at some point and could experience a mismatch in data. The discrepancy is from the API side and Google recognizes and mentions it here in its API documentation.

In the reports, you might see different values for "Conversions", which take a bit more time to get attributed to the number of "Clicks" that the account gets. This causes a conversion delay in the data shown in the reports. As the conversion value increases with time (without delay), the value for the Cost/Conv metric will also change. You can read more about how this works in this Google Support article.