<span class="link_user">@AlexBeck</span>,Yes, that's definitely a mistake. Even new pH meters should be calibrated before their first use, as they can lose their calibration during storage and shipping. It's always best to be sure of your readings!
<span class="link_user">@AlexBeck</span>, make a fresh batch of feeding use exactly the amount described by the manufacturer and get a 10% runoff. Now focus on the new nodes i would recommend a good defoliation.
Goodluck.