Bandwidht Flow From mANT 19s

i have 4 mANT 19s on my network, where all those APs are not able to flow the
BandWidth as expected, all those APs are set up on same parameters, i have attached
Screenshots of one of those which is only able to flow BW of 30Mbps where nearly 20
Clients are registered All users are provided minimum 10Mbps of internet.
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