Hello Kimberly,
Could you share the IDs that are causing the issue? I tested with a list of 50 random ensembl peptide IDs and I am not seeing an error with ORA, so I believe it may be ID list specific. Additionally, if you would like, you can still manually select the ID type if the detection system could not determine the type. The system takes a random sample of the IDs for detection purposes, which may result in inconsistent results for certain ID lists. More than 95% of ID lists we tested were consistent, but small or more generic ID types can cause this issue.
Best,
John