I had one like that today. 2 impressions and 26 clicks. Yeah. Sent it to G and asked them to look into it. Fastest response I've ever gotten from them but the guy said it could be the stats were out of sync and to keep an eye on it if it continued to let them know. If your concerned, send them an email.
Don't worry, it's normal. I get that all the time on minor channels. I once got 5 clicks with 1 impression. I wrote Google about it and they said all was fine. I don't write to them any more when this happens. If you have a lot of impressions and run a high ctr like that, then you might want to check into what's going on and contact Google.
Had one like that yesterday. No big deal, I've had them before. Someone clicks an ad, then backclicks and clicks another ad. Wierd thing was last week when I had a channel with 0 impressions and 1 click. Not sure how that happened.
Nothing to worry, 1 impression 2 click is normal for me, I never attempted to contact google in this case. However if a jumping CTR is happened in a day stat (i.e usually ctr=1% and jump to 5%), that about a time to contact google