Any idea what’s causing this yellowish light green?

its normal for new growth to come in yellow. it lacks chlorophyll because leaves start to produce it after they start getting exposed to light and overtime the density of chlorophyll increases to create the beautiful green we like. if it turns green after a day thats normal and nitrogen deficiency starts at the bottom of the plant because nitrogen is a mobile element in plants so plants pull that out from the lower leaves to sustain new growth. there is nothing wrong with them by the looks of it. your strawberries could use some epsom salt spray though haha