Are you sure it is (30%,30%,30%) ?. As the The total of the percentages for the test should add up to 100%.
Also,If your activity has multiple experiences that are set up with specific percentage targets, for example four experiences each configured to receive 25% of the traffic, a random number is generated and that number determines the experience shown to a visitor. In this example, if the random number is 30, the visitor would receive the second experience because 30 is between 25 and 50, the second range when dividing 100 into 25% chunks.If there has been very little traffic, for example at the beginning of a campaign, the traffic might not be split exactly as specified in the percentages. The more traffic you get, the more exact the percentages will become.