て vs る ending in answers before から

I have been getting several questions wrong lately with a blank before から, for instance the one below:
板をちょっと_____から頭に気を付けてね [下げる]
here, according to bunpro the answer is 下げる, and not 下げて.
In other questions the て form is required and ending with る is counted wrong.
There is probably a pattern here, but I am not seeing it and just guessing is also not very productive.

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てから = after
verb + から = because/so

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What he said ^

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