IP Override rule not working

[F_jabbari]

hello 

i was configure my IPS signature  as show in attached file.

as you see i was set TCP.Overlaping.Fragments Signature action to pass.

and in filter section i was block all signature that have low risk.

when i use this IPS Profile , IP Engine Block all TCP.Overlaping.Fragments and never pass the traffic .

would you please help me what should i do ?

fortios : 6.0.12 

paltform : 2500E