I purchased some of Home Depots "Select Paine" Boards to run a few projects.
.750'' x 12'' x 6-8' Select Pine

I made extra effort to ensure the boards I purchased were straight and flat and clean, etc.

After carving on 18'' long section with 12'' of width, I noticed the board had curved slightly down the entire length of board. Then, upon inspecting my other boards of the same species and sizes, they too had a slight curve down the entire length.

Questions:

Is it the South Texas heat and humidity causing this?

Can I do something to avoid this from happening BESIDES working in an air conditioned shop?

Is there a technique to re-work the wood to remove the curve? I did notice that a couple of the pieces did revert back to their original flatness once I brought them inside my house for a few hours exposed to nice, cool, air conditioned temps.

I live in Texas and it gets hot. I cannot afford to have boards curving up on me every time it gets a little bit hot in my shop.

This is "SELECT PINE" ....I would think it has been milled, cured and treated efficiently so as to avoid this type of issue. What am I missing?