Why do the ad boosts affect Time Warp profits so strangely?

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I was looking at the gold shop and noted that without my x4 ad boost, the profits from "1 time warp" on Earth were listed as $99.7 novemnonagintillion. After activating the boost, one would expect this to change to $398.8 novemnonagintillion, but instead it changed to $108.6 novemnonagintillion—roughly a 9% increase.
What's even stranger is that when I repeated this experiment on Mars, the listed totals had the correct ratio.
On Earth, I have:
- x42 multiplier
- 3 flux capitalors
- blue suit
- the Bonbon badge from Gates of Heck
On Mars, I have:
- green suit
- the Time Machine badge from An Excellent AdVenture 2017
Is there an explanation for this, or is it a bug?
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