In case different periodic rates on active and passive interfaces configured , the transmitter sending LACP rate is not same as configured.

Router A configuration:

lab@RouterA# show interfaces ae0
aggregated-ether-options {
    lacp {
        active;
        periodic fast;
    }
}

Router B configuration:

lab@RouterB# show interfaces ae0
aggregated-ether-options {
    lacp {
        active;
        periodic slow;
    }
}

lab@RouterA# run show lacp statistics interfaces
Aggregated interface: ae0
    LACP Statistics:       LACP Rx     LACP Tx   Unknown Rx   Illegal Rx
      xe-0/0/0                  90           3            0            0

lab@RouterB# run show lacp statistics interfaces
Aggregated interface: ae0
    LACP Statistics:       LACP Rx     LACP Tx   Unknown Rx   Illegal Rx
      xe-0/0/0                   4         121            0            0

Refer to: configuring-the-lacp-interval

The interval can be fast (every second) or slow (every 30 seconds). You can configure different periodic rates on active and passive interfaces. When you configure the active and passive interfaces at different rates, the transmitter honors the receiver’s rate.

lab@RouterA# run show lacp interfaces
Aggregated interface: ae0
    LACP state:       Role   Exp   Def  Dist  Col  Syn  Aggr  Timeout  Activity
      xe-0/0/0       Actor    No    No   Yes  Yes  Yes   Yes     Fast    Active
      xe-0/0/0     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
    LACP protocol:        Receive State  Transmit State          Mux State
      xe-0/0/0                  Current   Slow periodic Collecting distributing

lab@RouterB# run show lacp interfaces
Aggregated interface: ae0
    LACP state:           Role   Exp   Def  Dist  Col  Syn  Aggr  Timeout  Activity
      xe-0/0/0           Actor    No    No   Yes  Yes  Yes   Yes     Slow    Active
      xe-0/0/0         Partner    No    No   Yes  Yes  Yes   Yes     Fast    Active
    LACP protocol:        Receive State  Transmit State          Mux State
      xe-0/0/0                  Current   Fast periodic Collecting distributing