Buggy sound on FL Studio and REAPER

Hello! I'm trying to make just a simple single oscillator to run on a juce plugin using the C++ export function.

Here's the repo: https://github.com/pedrononino/RNBO-OSC

In FL Studio the sound is really buggy and choppy.

REAPER it sound constant but very distorted and there are some specific frequencies where it enters some kind of resonance and the volume booms.

In Max its sounding a little distorted but its the most consistent of them all. OSC.vst3 is on the root folder of the repo if someone could test in other DAWs.

The normal Audio Plugin export works OK.