BUY_LEVEL: 0.6
GAIN: 2
HIGH_BB: 25
LOW_BB: 25
That may be the cause.
Invert BUY_LEVEL and GAIN, at least.
For a *cool* configuration, BUY should be 5 up to 3 maybe.
This means it won't buy if the price is ABOVE 5 to 3% UNDER EMA (1 or 2, the lowest).
It ensures not to buy too high.
GAIN is the profit you expect, it won't sell unless you'll make 2% (here) profit from the bought price.
A cool configuration would be closer to 1% or even less (but count your trade fees).
Those are basic parameters.
There are really plenty of tutos and pages from Gunthar in the Help part of the forum.
Please take time to read.