I’m puzzled as to th reason why a good multipurpose compost should have such an imbalance of nutrients ... @cwr ... would you care to give us the brand and approx date purchased and any other factors you can remember. It would be good to know if there’s a faulty batch out there.
It's unlikely that it is a gross imbalance of nutrients in the compost, more likely the plant was not taking them up for some reason because of a lack of micro nutrient. (Think what's going on inside the plant, not outside it in this case). Hence why an early use of a liquid feed will often turn it around. It would seem from OP's update, they had exhausted the compost.
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