What soil type/medium are you using? Had a similar problem on some much younger plants a couple weeks ago, and the guys here at the forum pointed out that I had over-watered them.
When you water them last time? The soil looks dry.
Small pot dry soil. Water them give them a day and in the mean time prep your up-pot and get them transplanted to their perma-homes.
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I watered them and today they are coming around