My traffic allocation set on 50-50.
But i want to know is the variation going to show randomly?
I mean is it possible that I look and refrash my site many time and see the same variation?
yes, you were bucketed into seeing one of the variations.
If you look at your site by opening an incognito window with your browser then you will be bucketed to original or variation1 every time again, so only then you'll have the chance of seeing a different variation with your own browser.
@amit-webik- @marie is correct. When a visitor lands on your experiment page, he is randomly assigned to a variation based on your traffic allocation. Once the visitor is assigned to a variation, he is cookied with that variation ID (10 year cookie) so he will always see that variation as long as the experiment is running and as long as he doesn't clear cookies or use a new browser. This is to ensure a consistent user experience.
Because of this, it makes sense that you always see the same variation when you reflres the page.
Let us know if this helps clear things up for you!