Yeah. The formula is bad - it has gone rancid. Throw it away.
You need to put together a temporary formula for them. They are likely eating solids - blocks hopefully at this point, too. The recipe is:
Homemade Goat Milk Formula Plus (HGMF+)
3 tablespoons goat milk
3 tablespoons plain yogurt
2 tablespoons heavy cream*
½ egg yolk**
The first batch after their hydration, use just the goats milk and yogurt. If that goes down well and they are doing okay after a feeding or two, make a new batch and add in the heavy cream. Do the same thing with that - feed them 2 or 3 feedings to make sure they are tolerating it okay. The next time you make up the recipe, you can add the last ingredient the 1/2 egg yolk (yolk only; no white). Discard formula after 2 days in the fridge.
If you have a Trader Joes nearby, they sell fresh goats milk, heavy whipping cream, and a lovely full fat vanilla greek yogurt - their brand, so it is one stop shopping.
In the meantime, you should probably order another bag of 20/50 - if you haven't yet, you should be giving them the Henry's Healthy blocks and they also have FV:
https://www.henryspets.com/fox-valle...aby-squirrels/ and blocks:
https://www.henryspets.com/diets/.
And keep EVERYTHING - formula powder AND blocks - in the freezer!
I always ask about this - I did the same thing to my first baby not knowing the powder would go bad...