My loaches never gave me any such problems, but then again, mine isn't really considered as that heavily planted.
Is this is a newly planted tank? Perhaps the plants are not rooted yet. What plants were these?
Are there enough hiding places for the loaches? They love to hide in the holes underneath the driftwood, so they don't swim and mess around that much.
A big big bunch of Java fern may help as well, they love to hang around and play among the ferns.
If all else fails, then you may probably have to fish them out.
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