Crazy Feedback can easily happen - it’s noted in the manual somewhere - it’s to do with the levels in your ram recorder/players r1/p1 - try just fiddling with the levels - sounds like you have the internal (main out resample) level turned up - which you don’t necessarily want when sampling from the inputs.
I don’t know the exact param names but you can download the manual from Elektron -check the machine appendix at the back for the record/playback machines.