Woocommerce 2.4.X IPN Support

Hello, i have a site with wordpress 4.4.1 and woocommerce 2.4.12
When a customer buys a product it doesnt reduces the stock count. The IPN is well configured, it may be the woocommerce version support.

1) Is something else?
2) Can i fix it?
3) If not, are you working in a release with wc 2.4.X support?

Thanks

https://www.ads-software.com/plugins/woocommerce-mercadopago/