LTI 1.1 and LTI 1.3 share certain database columns for grade passback information. As such if you switch from LTI 1.1 to LTI 1.3 for an active course, there generally will be problems. LTI 1.1 saves the lis_sourced_id into the (incorrectly named) lis_source_did column of the user set. LTI 1.3 saves the lineitem into the global set lis_source_did column. So if the user set lis_source_did column is set by LTI 1.1 and then LTI 1.3 is switched to, then when the merged set is obtained from the database, the user set lis_source_did column will override the global set lis_sourced_did column value, and cause problems.
To fix this it would be perfectly save to delete all values of the lis_source_did column in all user sets in the database. LTI 1.3 doesn't use any of those, and in fact expects them all to be NULL. This can be done with
UPDATE courseID_set_user SET lis_source_did = NULL;Generally, we don't expect someone to start using LTI 1.1 in an active course, and then switch to LTI 1.3 while that course is still active. Such a switch is problematic in general.