This information is for Phase3A probes (which version do I have?).
The LFP band filter is 300Hz low-pass. The AP band filter is high-pass but can be set to 300, 500, or 1000Hz. A typical setting is 300Hz. In both cases, the filters are first order, meaning they are not very sharp, meaning you will see some LFP signals in the AP band and some spiking signals in the LFP band. This is normal. You should consider further filtering your AP band further before processing to remove more low frequency information.