I'm new with semp and will attempt to help out. If you have them in moisture control potting mix for a while before you moved them for more sun them it must be sun burn and not the mixture. When I have my semps acclimate to more sun I put them in area with filter light such as under a tree (receiving morning light, shade by noon, filter light afternoon, and early evening light). Every week I moved them to less shade and filter light area. Eventually I have them all in full sun and lightly cover those that are prone to sun burn (by placing the cover object to block the sun at its strongest.
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