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Likely you are able to capture and decrypt low modulation frames, such as group traffic, I.e. multicast and broadcast, from the AP. However, highly modulated unicast traffic with high data rates, you are missing. Proximity to test traffic can have an impact, too.
Solution is either to get a capture system that can pick up all the traffic or reduce the capability of the WiFi system so that the capture system can pick it up.
There are many examples of this on this site, for example, see
https://ask.wireshark.org/question/20865/80211-only-partially-decrypted/#20876
