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[–] 9600187? 0 points 1 point (+1|-0) ago 

If nothing is amiss, it's probably environmental. Tomatoes like acidic soils to grow, but I've heard that once the tomatoes are ripening, slightly more alkaline soils will produce sweeter tomatoes.

Maybe add a pinch of lime to the pot, and cut back on the watering when there's a nice size cluster ripening. And, of course, report back with your findings!