If I have an original contracting stating one thing but offered something different later, can I revert back to the original agreement?

Question Details: I run a publishing house. Due to a former partner whom we separated from before we LLC'd being dissatisfied, I'm running into a contract issue. In short, before we LLC'd and had the funds to handle all publishing costs, we did buy-ins for the anthologies that we release. The authors all signed contracts stating they understood the buy-ins were non-refundable. After my former partner pulled her shenanigans and her slander, several of the authors wanted to pull out and demanded refunds. In an attempt to salvage my company, I agreed. However, now I'm wondering if I should revert back to the original contract terms? The funds are to be used for marketing and promotion and some of it has already been spent as the advertising books early. I'd actually have to pull money from my own pocket at this point.

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