Do you have anyone else who can taste them? I think that would be your safest bet. Can you compare the kombucha to store bought kombucha? Maybe having some and tasting both one after another can give you a sort of base line on where the flavors should be. It's probably best to buy unflavored kombucha for this as you are unsure about your first fermentation, but don't try and compare it too closely since store bought kombucha almost always tastes different from our homemade kombucha, but use it as a way to differentiate flavors better.
I don't think it's weird at all, I can't tell the difference in mine either! I always have to get others to try out my batches to tell me if they are sweet or vinegary or what ever they taste, otherwise I just don't know! So my advice is to just ask others to taste it, if anyone is brave enough to try it.
