New Sparkling Iced Tea??

I’m very particular about which iced tea I consume so when I came across Woolworths’ locally brewed peach-flavoured iced tea, I was happy. It became my preferred drink. I usually buy the 6-pack of 500ml peach iced tea and there was no issue. Yesterday I opened one of the bottles to consume and it tasted odd. It tasted as if it was carbonated, I.e. as if there was gas in the drink. To put it plainly, it tasted as if it was some off peach-flavoured sparkling water. I dislike sparkling water so you can imagine my face upon tasting this. I proceeded to open another bottle to see if there would be a consistency but luckily there wasn’t. This “odd one out” was the 4th bottle I opened in the 6-pack so I’m concerned as to how it got approved. The packaging was identical to the other bottles; everything was right except for the taste. It left me concerned as I usually buy this product in bulk and now I’m wondering if I buy another 6-pack, will I stumble across another iced tea anomaly? I need this to be checked out and fixed, please.