I am using 1.81 and when I render the audio I get the whole song to be saved but when I try to import the file into Logic Pro only about 7 bars come in.
Are you rendering the wav file from the standalone version of Synthesizer V Studio, or the plugin (VSTi/AU) version?
If the rendered wav file has the full duration of the track then the issue is likely in your DAW rather than SynthV Studio.
So what’s weird is it didn’t do it in another song I tried today. Seems like there is something in the file that Logic is seeing that marks the end of the song.