Real-time export in Cubase with an external FX .Distortion in monitoring,

Hi
I use external devices such as compressors and EQs. I often insert an external compressor when exporting a mix. When I activate the external effect plugins, everything is ok. However, when I export in real-time, the playback sounds loud and distorted. But the exported file itself turns out fine.

This hasn’t happened before, so I must have changed some setting.
Any ideas on what could be causing this?

I use an RME audio interface