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The amplifier that i have shown below must also cause intermodulation products if this is the case, right? However it works fine. The output of that amplifier shows what it is supposed to show. Gain is as it is indicated in its datasheet. However it is bandlimited from 380-430 MHz which might be the reason why it doesn't oscillate. Our amplifier PSA4-5043+ works from 50 MHz to 4 GHz and it doesn't have any filter before it. Maybe duplexer is not sufficient for attenuating other signals.

By the way -125 dBm is the noise signals coming from air to antenna.