@tcamper1963 - I could well be speculating here, but I could wonder whether, despite your mega cycling (a big well done on that!), you may have been hitting your body with more carbs than you might have been used to in UK, and your body could have become accustomed to it, and is clinging.
I'm also in SE Asia at the moment. I've been here around 6 weeks, with another 6 to go. We dine out every night, are eating local dishes, and to date my noodle consumption is zero, and my rice consumption, probably amounts to 2 tablespoons from a couple of forkfuls of sampling from my OH's plates.
I know I am picking up sugar in many dishes, because the Thai/SE Asian way of cooking is to combine hot, sweet sour and spice into their dishes.
In your shoes, I might try, maybe a week of very low carb, which for me would focus on meat and eggs, but clearly for you it could be eggs (apologies if I missed you don't eat those), and maybe soya based produce, like tofu? (I'm also gluten free aand avoid all soy based produce where I can, which is my challenge here of course - all that soy sauce).
If you go for a week, say of very low carb, if your body is clinging to high numbers, because of past adventures, it could well "give in" in that time, and your numbers might notch down. If not, then I would be thinking a trip to the Doc, for some bloods to try to identify what's going on.
I imagine your Vit D will be OK after your trip. You don't say how long you were away, but I'm thinking to pack in 1300km cycling, it would be more than a few days!
In UK, I supplement my Vit D, with a combination of D3/K2-Mk7 and got my levels up nicely. Last year I stopped the supplement before coming away and was surprised to find that despite all this fabulous sunshine, my levels stayed static. I have done the same again this year.
It's a tricky one, and I hope you find a simple solution. Your dietary choices, to my inexperienced (of vegetarianism) do seem to cut down the options a bit, but if those are your choices, then I'm sure there will be a way around it.
It'll be good to hear how you get along.