Reporting of click events on images in Google Optimize isn't matching Google Analytics. Has my a/b testing experiment been configured correctly?

I've created an Optimize experiment where I've switched two of the ads on the homepage to another style of image. Event click tracking is already set up on these through Google Tag Manager and I've added this to the experiment's objective section in Optimize. However, the reporting isn't accurate.

Google Analytics is reporting 8 clicks on one ad and three on the other, whereas Optimize's reporting has zero on one and one on the other for the variants, while the original has zero on the first and two on the other. The figures don't tally up to be the same as Google Analytics.

It seems the ad banner clicks being track on GA/GTM aren't being recognised by Google Optimize.

Can anyone help please?

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