There are two reasons for this:
1) Too many tabs are opened on your browser
We suggest you to clear all your tabs on your default browser before clicking on an offer. There is a known bug in Chrome that causes the offer redirects to fail when there are existing tabs opened. When this happens, you either get stuck in a blank page, or you are redirected to an offer you previously clicked on.
Bottom line: To ensure that redirect happens successfully, close all your tabs first, then click on the offer and wait for it to redirect you to the Google Play store. If you have done the above and you're still going to a blank page or wrong app, then it's because of reason #2 below.
2) Campaign expires
When a campaign expires (because the Advertiser pauses it), you could be redirected to another app by our partners, or it could lead you to a blank page. This happens when we pull the offers from our partner's system, but their system hasn't been updated in time.
We suggest you to skip the offer and try another one.