strange distortion when using ring modulator

[ipomea]

i have virus Ti desktop, and use it as VST with ableton. problem is when im using ring modulator im experiencing something like random distortions on sound. when ring modulator is on lower values this unwanted sounds disappear, but course whole idea for sound then changes. course this is problem is present in number of patches, and mostly i play them as chords. also, im not using distortion effects in this patches.
is this normal thing for ring modulator, or i can do something to avoid this problem?