I found an issue where if you record the same note twice at the same time point in the same instrument in two loops the level becomes kind of impossible to beat. I encountered this when recording a beat where it felt natural to play the ending beat that also happened to be the starting beat of the next loop
Here's a minimal example:
R3N10:14 12-07-2023C0L0H0I0Q1M0S0K0T0,0T
And here's an example in a full song (the keyboard that plays chords is one example):
R3N09:55 12-07-2023C0L0H0I0Q1M0S0K0T0,1.91,3.91T1.53,2.91I1Q1M0S0K0T0.09,1.56,2.04,4.08,0.02T3.13,7.18T6.09I4Q1M0S0K0T0.02,5.64T2.47,4.46T1.99,3.93T1.55,7.04I5Q1M0S0K0T6.48,0.02,2.06,5.87T6.96,3.95T7.48,2.03,5.84T0.02,3.95I6Q1M0S1K0T0,0T3.17,5.04,7.49T4.15,6.46T6.04K1T0,4.06,0T1.89,7T0,7.02T1.89,4.06,0I7Q1M0S0K0T0.47,1.38,2.34,2.87,5.37,6.86T4.04,5.86
I've also encountered the same issue in some random beat levels.