Can someone please (nicely) explain to me why I keep having an electricity bill? Sorry I'm a solar noob.

Hi, solar noob here. We live in Southern California maybe it's just that we're in the winter, but we keep having an electric bill every month. We have THREE Tesla Power Walls and we're putting in a pool so I really want to make sure our system is performing as well as it should be when we start heating the pool. I can't believe we're using exorbitant amounts of electricity. I'm attaching pictures of my electric utility bill "usage" report from December as well as a screenshot from the Tesla app for December and sunpower's app for December. Can someone tell me what the heck is going on?

https://preview.redd.it/yiq3iz9cymge1.jpg?width=1170&format=pjpg&auto=webp&s=0384866fa74651a464de39cee99a5c27084c6f12

https://preview.redd.it/rhumg9n4ymge1.jpg?width=1170&format=pjpg&auto=webp&s=8d68adc3f260d49d5aa26b6d412f756af2c07a30

https://preview.redd.it/yfdlzneaxmge1.png?width=1784&format=png&auto=webp&s=ec7f6248944b3dcab543f2d9c6a4fd3d7cac3b30

https://preview.redd.it/zcfyokibxmge1.png?width=2094&format=png&auto=webp&s=59231c048f02d382ce1af8d5cca63d0b92a6e3b2

https://preview.redd.it/yrx0j5fdxmge1.jpg?width=1170&format=pjpg&auto=webp&s=09c1bbb53d98ea7f25da81ddf2b18394dc270a10