BlueARP is great and free, however as it’s not a MIDI Effects plugin you have to add it on a VST Instrument track and then route the output of that track to the instrument that you want the arp to be heard.
I’m more worried that you’re getting issues on basic Arpache presets, i’ve never seen that happen an it’s usually pretty solid in those occasions for me.
Have you tried enabling the write mode on the MIDI Effects slots? I forget what it’s called now, but you toggle the control and it will save the arpeggiated data into the timeline when you record, so you may be able to work out what’s going on looking at that data?
Edit: here it is, this button:-
Record some of the garbled Arp and take a screenshot of the MIDI Data recorded if you can, be interesting to see what’s being generated.