Is it normal my juice turned the indicator blue?

We do pH calculations and titrations. When we had a free minute I would take a cold testing tube and I was so horny that I "wagged" a bit during the break. Now, I don't know why, my mates did use the content of that testing tube for titration and measured the pH value when nothing was dropped into it and each 5ml.

But is it normal that it turned blue at the beginning?

Is It Normal?
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