No matter what yield I put in the mineral selection screen, it changes back to a normal 100% yield every time i reload the game

There is a setting to change the amount of resource per tile, it is set to 5000 as the default.
In my testing, the value last entered is saved. If I change it from 5000 to 80000, and then select a resource, and then save.
When I restart the game, 80000 is remembered in the Resource Selector.

Not in the resource selector itself, but the actual ore reverts back to only 100% yield after loading the save

My apology, I am confused.
Are you saying that if the ore was placed 5000 per tile, and some is then mined. When saved and reloaded, the amount of ore on the tile is back to 5000?

Yes, back to 100 on the actual yield percentage of the ore

If you post a mod list, I would be happy to try to resolve the issue.

Thank you for the help, I will attempt to send my mod list soon.

Ah, this is for fluid resources like crude oil. I see the issue now.
(And I see the graphics issue for pumpjacks).

Thank you very much for reporting the issue!

Version 0.17.2 has been uploaded. It should resolve the issue with the yield of fluid resources not decreasing.