Click number discrepancy

I have a split testing page set up using pretty links to track the traffic.

We pretty link the inbound URL to mask the exact page and UTM tracking we want to add which gives us an inbound number of about 250 clicks/unique. Worth noting that Google Analytics only shows ~200 users with the campaign UTM we configured. The page has the following JavaScript to split between 3 more pretty links:

<script>
var randNum = Math.floor(Math.random() * 3);
if (randNum == 0){
//http://www.medicaldevicesgroup.net/resources/bioengg-dnd/
document.location.replace('https://medgroup.biz/oznl');
} else if (randNum == 1) {
//http://www.medicaldevicesgroup.net/resources/bio-engg-dnd/
document.location.replace('https://medgroup.biz/hmig');
} else {
//http://pages.machinedesign.com/medical-device-technology?code=UM_10x
document.location.replace('https://medgroup.biz/l5e0');
};
</script>

The total of the 3 pretty links is closer to 300 unique hits, but this does not match up with the inbound link of 250 and I cannot discover the reason why. I’ve added some console logs and do not see the code activating the other URLs, so I do not believe I’m triggering additional re-directs.

Any insight as to why the numbers are off by so much?

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