tomato question ( re: taste)

Have been growing tomatoes for a good number of years- first time encountering this situation.
A particular strain, which I will describe as a large cherry variety, size of a cherry pepper- approx.35- 40mm diameter. Has a pronounced "aftertaste" which hints of onion or garlic? Quite redolant not entirely pleasing. Also, tastes awful when eaten l warm off the vine. Rather, needs to be refirigerated for some reason... Hybrid ? Weird GM thing goin on ?
Your comments are eagerly anticipated.
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