Log what you actually did
Enter the load you used, the reps you completed, and the RIR you honestly felt at the end of the set. If form broke down early, do not count extra messy reps just to hit the top of the range.
Accurate logs matter because Get2Lift uses them to prefill the next set and guide the next appearance of that exercise.
Use RIR as a simple effort check
You do not need to make RIR complicated. 0 RIR means no clean reps left. 1-2 RIR means hard, but still controlled. Higher RIR means you likely had more room than the target asked for.
If a set is unusual, let the next one reset the signal
One awkward set does not ruin the program. Log it honestly, then use the next set and next session to bring the recommendation back in line.