This is how the game is designed. Your little guy has a random chance of producing 0, 1 or 2 design or tech bubbles per "tick" at the start.
Since it's your first game, these random variances make a big difference to the overall score.
As you get higher and higher scores, the randomness kind of averages out. Although you do get the chance for really big bubbles after you start to level up, they just get absorbed into the average bubble level..