A target is not a promise to exceed your authorized monthly spending cap. If the remaining budget funds only part of the target, the preview shows shorter coverage. Paid-number prices, reserved credits, known credit expiry, and funding priorities affect the estimate.
Compare the confirmed purchase with its preview and your current paid demand. Forecast does not keep making repeated purchases in the same funding episode when the refill cannot restore coverage above the trigger; it asks you to act. Review the notice and cap or top up manually. Send support the reference if the credited purchase differs from its confirmed result.