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My 2ct, but for a while Royal Enfield motorcycles (who are now fabricated in India, after GB sold off all their assets, and moved to India for cheaper production), had similar cheap fuel injection too, but quickly went back to carburetor.
The original Royal Enfield bikes are created with a carb, easy fix when broken. Those fuel injections not. But in order to comply with European law, they had to upgrade their bikes.
The european versions contained a fully functional Fuel Injection system, but the Indian bikes had a cheap fuel injection system like that.
The FI system Indian RE bikes had, did not read the exhaust as it had no O2 sensor in the exhaust, thus it could not autocorrect the air/fuel ratio, and thus was operating just the same like a carburetor. It might work fine on a certain day, but on a rainy day, with different fuel, it would operate worse, or just like a badly set up carburetor.
Just sharing the story, it might, or might not be the same issue here.
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