I would transplant them soon if possible, and wash the medium while doing it. There's a high chance of something funky in there. Like slightly wrong pH coupled with maybe too high of some microelement can lead to some really bizarre things happening, or some other contaminant in the potting mix. There were some tests here for organic fertilizers and some scored up to traces of 7 pesticides, and even some of the high brands had like 3 (plus heavy metals). Potting mix is even more likely to be contaminated, especially lately with so many going 'peat reduced, for the environment', which means the clean sources of peat are now replaced with other things which are likely to be contaminated.
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