Look like some minor cal mag deficiency in early stage. don't worry about it since if you use basic nutes for veg stage it will contain enough cal mag to fix this deficiency cause your base is soil so not a big problem.
Hi @Resin_Randy , they seem to me to be PH variations but mainly it is a lack of calcium, you will have to apply some source of calcium, add some calmag product in corrective mode. good luck mate 👍