I would go by your own experience, that the product you are using appears unsuited to you due to this side effect you experience.
I would not recommend anyone take a gram per day of low purity, 20% forskolin product.
I know of no evidence that forskolin itself, even at the high dose of 100 mg twice per day, would have this effect. However, the product you are taking also is providing 400 mg twice per day of other herbal compounds. A fairly wide spectrum of active but poorly characterized products are known to be present in Coleus forskohlii root.
Extract of another Coleus species is known to be able to increase lactation, but the compound within it that does this is unknown. Whether low purity Coleus forskohlii root extract contains that material is unknown, but could be possible.
In any case I'd go by your own experience, and if wishing to use forskolin, use a purified product.