It's overload in the front end of your SDR. Those stations are NOT in the band. You will need a AM broadcast filter. Something like this: LINK
Sorry for that. I have seen this BCB filter, they offer modifications at no addicional cost, have a try: http://www.dlwc.com/
Another sites: (cheaper) https://kd2c.com/filters-%26-chokes https://www.arraysolutions.com/as-1r8-hpf-rx https://www.amazon.es/Flamingo-AM-Broadcast-Bandstop-Aplicaciones/dp/B079CMB44V#customerReviews