Click the "Update" button. If this doesn't work... add second indicator and then in the block choose the one you want. I think the problem is only visual, it appears that some indicator is selected, but it's not. I think that "Update" will help.
Martingale checks what was the profit (bigger or lower than 0) and the lot size of the latest trade and depending on that it decides what will be the lot size of the next trade. But it does not care what was the real profit/loss in money. It's the same if the last trade had loss of 0.1 dollars or 100 dollars - in both cases the next lot size will be doubled
