This makes zero sense.
However, we all know PWS stations can run warm if baking in sun and not sited properly. Even with a shield it can happen. In your case BED was a few cooler. I feel like it still happens to yours. Even with a shield my station temps skyrocket when the sun hits my station in the morning, but levels off when it’s more shaded. I can’t help it but fortunately it doesn’t affect my highs.