I have latest versions of both products installed on Windows 11, FIR Designer M is a demo version. The issue exists even without loading any project files. JUst open FIR Phase Adjust tab and select any of the all-pass filter prototypes, then drag the gray pointer that appears in the graph area on the upper right window. The speed that the dragged pointer moves is much faster in FIR Designer M than in FIR Designer. I noticed this behaviour even with last versions of both softwares. I will email the project for youre reference.