What could cause D3 bleeding down. I eat vit d rich food and sun here in texas is is all year round and yet my level is 27.?

Which Vitamin D? There are two major forms of vitamin d that are routinely measured, 25 hydroxyvitamin d and 1, 25 dihydroxyvitamin d. I have seen many cases where the former is low and the latter is high. This can be caused by excessive immune system stress on activated macrophages. Get both levels checked before concluding you are low.